Lumapower has been in the illumination business for about 10 years now, and has been making LED flashlights since 2006. They've got several lights that they're well known for, but their new EDC series will be my first experience with Lumapower. So far the new EDC series consists of the LM21 (single AAA or 10440 li-ion), LM31 (single AA or 14500 li-ion), LM32 (double AA), and LM33 (single CR123 or 16340 li-ion). They've also announced that the series will include the LM22 and LM36. They've confirmed that the LM36 will take a single 18650 li-ion, and my guess is the LM22 will take two AAA. Each light in this series has the same look, with knurling on each end and a smooth portion in the middle where the brand and model number are printed. They have matching anodizing and green tail switch boots, with a glow-in-the-dark O-ring in the head, so they look pretty slick as a family.
Thanks to Ricky at Lumapower for supplying the LM33 for review.
I'll be reviewing the LM33 in two sections: first, I'll discuss the light objectively (the facts about the light itself), then I'll discuss the light subjectively (my impressions about the light's performance when used for specific applications). This is a good quality, budget EDC style light, so I'll be reviewing it as such. If you have any other specific applications you'd like the light tested for, let me know and I'll see what I can do.
3-Minute Overview
Below is a video "quick review" you can watch in just a few minutes, if you're not up for reading the full review right now:
Objective
Manufacturer's Specifications
MSRP: $33
Packaging
The LM33 comes in a pretty fancy package, mostly clear/white with some iridescent-like lettering on the front. The package includes the LM33, a user manual, two spare o-rings, and a lanyard.
Construction Quality
The LM33 is a simple, compact 1xCR123 EDC-style light. It's got a slim design, and it's only a little over twice as long as it's battery. It feels light weight but still strong enough to hand a little abuse. The anodizing is a shade of medium-dark grey.
The EDC LM series all use a Cree XP-G emitter, which tends toward having a tight hot spot with a little spill. So, even though the LM33 has a small reflector, it has pretty decent throw for a light it's size. The emitter is centered in a small white ring, which helps send the most possible light out the front. The LM series all feature a glow-in-the-dark o-ring in the head, which keeps out water and adds some style (and possible functionality) at the same time. My review sample uses a mildly textured reflector, which helps to smooth out the beam at the cost of a little throw. I have been informed by Lumapower (as of 6/3/12) that they are currently planning to replace the textured reflector with a smooth reflector.
The head of the LM33 has two lightly knurled bands that add grip and style. The grip here is essential for battery changes, which happen by removing the head. The body is smooth, and slightly smaller in diameter than the head and tail. The only thing printed on the light is the brand, model, and s/n on the side. The tail section is one piece with the body, and has the same light knurling as the head. The tail also has two very small holes for a lanyard at the end.
The switch of the LM33 is relatively small in diameter, and has a stiffer-than-normal feel, which means you have to apply decent pressure to use the switch. This makes accidental activation unlikely. It is a forward-click switch, which means that you can press the switch half-way for momentary on, or press it all the way to click into constant on. The switch is also used for mode changes. The switch is made from GITD material, making the light easier to find in the dark.
Because the switch is fully set into the tail, the LM33 can do a solid tail stand.
Now, let's take the light apart!
Without the use of tools, the LM33 comes apart into two pieces. (A pair of tweezers can totally disassemble the light, giving easy access to the LED if desired.)
The LM33 uses a mechanical reverse-polarity protection design. The positive terminal of the battery makes contact with the center circle, which is set back just a bit from the raised area around it. This means that only the positive terminal can make contact here, so if the battery is inserted backwards, no electrical connection can be made.
The LM33 has just a few square, anodized threads. The shortness of the threaded section keeps the overall length down, and means it only requires a few turns to remove the head. The square cut and the anodizing on the threads will help them last longer, and in addition, the anodizing allows the LM33 to use a mechanical lockout feature, where the light can be slightly unscrewed and prevented from turning on at all until re-tightened (the threads will not make any electrical contact until tightened down). This is useful for long term storage or transport (or if you're really afraid of it coming on in your pocket).
The LM33 has a spring in the base, where the battery makes contact with the switch. When the spring is uncompressed, the battery sticks out from the body just a bit.
Accessories
The only accessory included with the LM33 is the lanyard. It is black and light grey, and is designed to be quickly removable by squeezing a lock mechanism and separating into two pieces. Lumapower does have a diffuser tip and holster available at extra cost.
I've been informed by Lumapower that the LM33 will soon include a pocket clip, and I'll update this with pictures when I receive the clip.
Dimensions
User Interface
The LM33 has three brightness levels, Low-Medium-High, accessible by turning the light on and off using the tail cap switch. To turn the light on, press the switch once. To move to the next brightness level, turn the light off then back on less than 2-3 seconds. When the light is not used for longer than a few seconds, it defaults back to Low, so you can know that when you go to pick it up and use it, it will always start in Low.
Action Shots
Light in Hand
White Wall (Low, Medium, High)
ISO 100, f/3.3, 1/10"
BeamSlice
Indoor Shots (Low, Medium, High)
ISO 100, f/3.3, 1"
Outdoor Shots (Low, Medium, High)
ISO 100, f/3.3, 2.5"
Performance
Submersion: Lumapower makes no claims for IPX-X ratings of the EDC LM series, so I have not tested the LM33 under water. It does have o-rings in all the appropriate places, so I'd guess it can handle a little moisture, but I'd recommend keeping it out of the water.
Heat: The LM33 heats up fairly quickly in High mode when using a lion, and is uncomfortable to hold by the end of it's run. I tested the LM33 on high with just a fan, then in an air conditioned room with a fan, and saw a measurable improvement in output with the extra cooling.
PWM: The LM33 uses pulse-width modulation for the low and medium modes, visible only when you move the light very quickly, and not at all audible.
Drop: I could find no claims by Lumapower of the drop resistance of the LM33, so I tested it by dropping it from a height of about 1 meter into grass and carpet, and can find no evidence of damage.
Reverse Polarity Protection: The LM33 has mechanical reverse polarity protection, which means inserting a battery backwards will not damage the light (see the "Construction Quality" section for more details).
Over-Discharge Protection: I can find no evidence or claim of over-discharge protection with the LM33, and seeing that it can accept both li-ions and lithium primaries, I recommend avoiding unprotected li-ions in this light, unless you are diligent to keep it well charged.
Spectral Analysis
All light that we see as white is actually made up of several different colors put together. The relative intensities of the different colors in the mix are what determine the tint of the white we see. For example, cool white LED's have a lot of blue, and warm white LED's have more red or yellow. This measurement was done on a home made spectrometer. Note: the peak in the 900nm region doesn't really exist, it's a piece of the second-order spectrum that's showing up here because of the high intensity of the light source.
Output, Current Draw and Runtime
Note: Lumapower's runtimes stated as xxx/xxx represent time to 50%/time to 1%. ANSI runtime ratings are the time it takes for a light to fall to 10% of it's original output. I've been informed by Lumapower that their lumen ratings are "emitter lumens", not "out-the-front lumens". They will be making measurements of the OTF lumens and I'll update this with the new info when I receive it.
Note: The vertical axis of the graph below represents a relative brightness measurement using a home made light box. The horizontal axis is time in hours:minutes:seconds. Runtimes are stated in hours:minutes:seconds. These graphs may be truncated to show detail. All runtimes were done with a fully charged AW 16340 protected ICR battery.
Mode Comparison
High
Note: Lumapower upgraded the switch used by the lights in the EDC LM series. I've been informed that the switch upgrade will only improve performance when using 2xAA or 1xCR123. As you can see, there is very little difference when using 1x16340. Also, I performed a test giving extra cooling on high mode, and it made a small but measurable improvement to the output.
Medium
Low
Subjective Review
General
Quick break down:
+Compact
+Good throw from small package
+Even tint (cool, but no obvious green or purple)
+Nice style, matches series
+GITD at both head and tail
+Defaults to low mode
+Accepts both rechargeables and primaries
+Great price for what you get
+Easy access to guts
-Switch stiffness + small size can be uncomfortable
-Max output seems lower than advertised
-A bit of battery rattle when using 1xCR123
-Lanyard difficult to install
There are a lot of things I really like about the LM33, and not much to be disappointed with. A lot of the features I like with the LM33 apply to the whole EDC LM series, including the GITD in front and back, XP-G emitter in a compact package, and general good style. The choice of XP-G here sets these apart a little as most manufacturers are using the newer XM-L in their new lights, but these fill the niche of an up-to-date EDC with a bit of throw, because the XP-G emitter is more tightly directed than the XM-L. The GITD in both front and back is really a plus, in my book. I've seen many lights with GITD switch covers, but in my experience it's not too often that the tail of the flashlight gets much light hitting it when the flashlight is turned on. With the GITD O-ring inside the head, it gets charged every time you turn on the light. If you're afraid of revealing your position, that O-ring could be removed and you could probably find a black one to replace it, but I really like the ability to find my light easily in the dark, and see quickly which end is the front (it can be hard to tell on roughly symmetrical lights like this one).
I really appreciate the UI here. On some more expensive EDC's you can get some fancier UI's like magnetic control rings or many programable choices, but the LM33 keeps it very simple. In general, I don't like UI's where you have to click a bunch of times to cycle through modes. However, one of the main reasons for that is that I'm frequently unsure which mode the light will come on in the next time I pick it up. By defaulting to low each time, I always know where I'm starting, and I don't have to worry about blinding anyone unintentionally. Starting in low may not be considered a "tactical" light, but for a lot of purposes this is going to be what you want. Just take this fact of starting in low each time into account when considering this light for the uses you have in mind.
There are just a few flaws I've found with the LM33 in particular. The first is that there is a tiny bit of battery rattle with some brands of CR123 batteries, though I haven't observed it with 16340 lions at all. Normally, this isn't too big of a deal, and you can just put a slip of paper around the battery as a spacer to secure an annoying rattle. However, in the LM33 I've found that rattling a CR123 battery can actually make the light turn off, and I'll need to re-rattle it a bit to turn it back on. I suspect that the mechanical anti-reverse polarity protect might actually be causing a short at times, if the battery slips over to touch both the lowered and raised portions of the head.
So, if this is the case, you'd need to be very careful about not leaving any CR123 batteries in the light when not using it, so that no short is possible.
The only other flaw I've found is that the output on high with a lithium ion seems to be significantly less than advertised (450 lm). I don't have enough data on my lightbox yet to make claims of absolute lumen output, but when I compare this to other lights (even same emitter in similar sized reflector) it seems to be putting out somewhere around the 200-300 lumen range. Lumapower has informed me that these lumen claims are "emitter lumens", which means they are calculated based on Cree's specs for what the emitter will put out when given a certain current. Soon Lumapower will be doing measurements of OTF lumens (what actually comes out the front of the light), and I'll post that data when I receive it.
Overall, I've found that this light fills it's niche well, and for a great price you can have a very nice light.
EDC
By naming this their "EDC" series, Lumapower seems to be suggesting a certain use for these lights. Every Day Carry means different things to different people, but for me I have a few things I look for when deciding which I want to have with me at all times.
First, I like that this can accept both rechargeable and primary batteries. I use rechargeables regularly to keep costs down, and I don't want to be too afraid of costs to pull out my EDC. However, it's important to me that in an emergency I can use primary batteries as well. For this reason, I really like the LM33 as an EDC, though I think it's bested by the LM31, which can accept either 14500 lion, AA NiMH, or AA alkaline. I really value the common availability of AA's in a pinch, and it's only slightly longer. But if you prefer extra brightness over battery convenience, the LM33 is going to be more your style.
Next, I want it to be easy to always have with me. The LM33 gets point for being very compact, but loses points on the poor lanyard and lack of clip. I don't use clips on most my lights, but on my EDC I want to be able to clip it to shorts or PJ's that don't have pockets. If a clip is a big deal to you, check out the LM21.
Also, it've important to me that my EDC have a good range of output. I want low available for most of the time, but I want very high available when I need it. The LM33 doesn't have super low low or super high high, but rather reasonable low and reasonable high. Plus, it's got a little extra throw compared to your average EDC.
On that note, the choice of XP-G leans this toward an EDC for a person who gravitates to certain tasks, namely, longer range. Up close, the tight spot of the XP-G can be a little too bright and the surrounding area a little too dim, but at distances the XP-G will do great. So generally, if you spend most of your dark time indoors, I'd suggest something with an XM-L for more flood, but if you spend more or your dark time outdoors, the XP-G would be a great choice.
Long Term Impressions
I'll fill this part in after carrying the light for a while. If nothing get's added here, either I find nothing else worth noting about the light, or I end up not using it often.
Thanks to Ricky at Lumapower for supplying the LM33 for review.
I'll be reviewing the LM33 in two sections: first, I'll discuss the light objectively (the facts about the light itself), then I'll discuss the light subjectively (my impressions about the light's performance when used for specific applications). This is a good quality, budget EDC style light, so I'll be reviewing it as such. If you have any other specific applications you'd like the light tested for, let me know and I'll see what I can do.
3-Minute Overview
Below is a video "quick review" you can watch in just a few minutes, if you're not up for reading the full review right now:
Objective
Manufacturer's Specifications
MSRP: $33
Packaging
The LM33 comes in a pretty fancy package, mostly clear/white with some iridescent-like lettering on the front. The package includes the LM33, a user manual, two spare o-rings, and a lanyard.
Construction Quality
The LM33 is a simple, compact 1xCR123 EDC-style light. It's got a slim design, and it's only a little over twice as long as it's battery. It feels light weight but still strong enough to hand a little abuse. The anodizing is a shade of medium-dark grey.
The EDC LM series all use a Cree XP-G emitter, which tends toward having a tight hot spot with a little spill. So, even though the LM33 has a small reflector, it has pretty decent throw for a light it's size. The emitter is centered in a small white ring, which helps send the most possible light out the front. The LM series all feature a glow-in-the-dark o-ring in the head, which keeps out water and adds some style (and possible functionality) at the same time. My review sample uses a mildly textured reflector, which helps to smooth out the beam at the cost of a little throw. I have been informed by Lumapower (as of 6/3/12) that they are currently planning to replace the textured reflector with a smooth reflector.
The head of the LM33 has two lightly knurled bands that add grip and style. The grip here is essential for battery changes, which happen by removing the head. The body is smooth, and slightly smaller in diameter than the head and tail. The only thing printed on the light is the brand, model, and s/n on the side. The tail section is one piece with the body, and has the same light knurling as the head. The tail also has two very small holes for a lanyard at the end.
The switch of the LM33 is relatively small in diameter, and has a stiffer-than-normal feel, which means you have to apply decent pressure to use the switch. This makes accidental activation unlikely. It is a forward-click switch, which means that you can press the switch half-way for momentary on, or press it all the way to click into constant on. The switch is also used for mode changes. The switch is made from GITD material, making the light easier to find in the dark.
Because the switch is fully set into the tail, the LM33 can do a solid tail stand.
Now, let's take the light apart!
Without the use of tools, the LM33 comes apart into two pieces. (A pair of tweezers can totally disassemble the light, giving easy access to the LED if desired.)
The LM33 uses a mechanical reverse-polarity protection design. The positive terminal of the battery makes contact with the center circle, which is set back just a bit from the raised area around it. This means that only the positive terminal can make contact here, so if the battery is inserted backwards, no electrical connection can be made.
The LM33 has just a few square, anodized threads. The shortness of the threaded section keeps the overall length down, and means it only requires a few turns to remove the head. The square cut and the anodizing on the threads will help them last longer, and in addition, the anodizing allows the LM33 to use a mechanical lockout feature, where the light can be slightly unscrewed and prevented from turning on at all until re-tightened (the threads will not make any electrical contact until tightened down). This is useful for long term storage or transport (or if you're really afraid of it coming on in your pocket).
The LM33 has a spring in the base, where the battery makes contact with the switch. When the spring is uncompressed, the battery sticks out from the body just a bit.
Accessories
The only accessory included with the LM33 is the lanyard. It is black and light grey, and is designed to be quickly removable by squeezing a lock mechanism and separating into two pieces. Lumapower does have a diffuser tip and holster available at extra cost.
I've been informed by Lumapower that the LM33 will soon include a pocket clip, and I'll update this with pictures when I receive the clip.
Dimensions
User Interface
The LM33 has three brightness levels, Low-Medium-High, accessible by turning the light on and off using the tail cap switch. To turn the light on, press the switch once. To move to the next brightness level, turn the light off then back on less than 2-3 seconds. When the light is not used for longer than a few seconds, it defaults back to Low, so you can know that when you go to pick it up and use it, it will always start in Low.
Action Shots
Light in Hand
White Wall (Low, Medium, High)
ISO 100, f/3.3, 1/10"
BeamSlice
Indoor Shots (Low, Medium, High)
ISO 100, f/3.3, 1"
Outdoor Shots (Low, Medium, High)
ISO 100, f/3.3, 2.5"
Performance
Submersion: Lumapower makes no claims for IPX-X ratings of the EDC LM series, so I have not tested the LM33 under water. It does have o-rings in all the appropriate places, so I'd guess it can handle a little moisture, but I'd recommend keeping it out of the water.
Heat: The LM33 heats up fairly quickly in High mode when using a lion, and is uncomfortable to hold by the end of it's run. I tested the LM33 on high with just a fan, then in an air conditioned room with a fan, and saw a measurable improvement in output with the extra cooling.
PWM: The LM33 uses pulse-width modulation for the low and medium modes, visible only when you move the light very quickly, and not at all audible.
Drop: I could find no claims by Lumapower of the drop resistance of the LM33, so I tested it by dropping it from a height of about 1 meter into grass and carpet, and can find no evidence of damage.
Reverse Polarity Protection: The LM33 has mechanical reverse polarity protection, which means inserting a battery backwards will not damage the light (see the "Construction Quality" section for more details).
Over-Discharge Protection: I can find no evidence or claim of over-discharge protection with the LM33, and seeing that it can accept both li-ions and lithium primaries, I recommend avoiding unprotected li-ions in this light, unless you are diligent to keep it well charged.
Spectral Analysis
All light that we see as white is actually made up of several different colors put together. The relative intensities of the different colors in the mix are what determine the tint of the white we see. For example, cool white LED's have a lot of blue, and warm white LED's have more red or yellow. This measurement was done on a home made spectrometer. Note: the peak in the 900nm region doesn't really exist, it's a piece of the second-order spectrum that's showing up here because of the high intensity of the light source.
Output, Current Draw and Runtime
Note: Lumapower's runtimes stated as xxx/xxx represent time to 50%/time to 1%. ANSI runtime ratings are the time it takes for a light to fall to 10% of it's original output. I've been informed by Lumapower that their lumen ratings are "emitter lumens", not "out-the-front lumens". They will be making measurements of the OTF lumens and I'll update this with the new info when I receive it.
Note: The vertical axis of the graph below represents a relative brightness measurement using a home made light box. The horizontal axis is time in hours:minutes:seconds. Runtimes are stated in hours:minutes:seconds. These graphs may be truncated to show detail. All runtimes were done with a fully charged AW 16340 protected ICR battery.
Mode Comparison
High
Note: Lumapower upgraded the switch used by the lights in the EDC LM series. I've been informed that the switch upgrade will only improve performance when using 2xAA or 1xCR123. As you can see, there is very little difference when using 1x16340. Also, I performed a test giving extra cooling on high mode, and it made a small but measurable improvement to the output.
Medium
Low
Subjective Review
General
Quick break down:
+Compact
+Good throw from small package
+Even tint (cool, but no obvious green or purple)
+Nice style, matches series
+GITD at both head and tail
+Defaults to low mode
+Accepts both rechargeables and primaries
+Great price for what you get
+Easy access to guts
-Switch stiffness + small size can be uncomfortable
-Max output seems lower than advertised
-A bit of battery rattle when using 1xCR123
-Lanyard difficult to install
There are a lot of things I really like about the LM33, and not much to be disappointed with. A lot of the features I like with the LM33 apply to the whole EDC LM series, including the GITD in front and back, XP-G emitter in a compact package, and general good style. The choice of XP-G here sets these apart a little as most manufacturers are using the newer XM-L in their new lights, but these fill the niche of an up-to-date EDC with a bit of throw, because the XP-G emitter is more tightly directed than the XM-L. The GITD in both front and back is really a plus, in my book. I've seen many lights with GITD switch covers, but in my experience it's not too often that the tail of the flashlight gets much light hitting it when the flashlight is turned on. With the GITD O-ring inside the head, it gets charged every time you turn on the light. If you're afraid of revealing your position, that O-ring could be removed and you could probably find a black one to replace it, but I really like the ability to find my light easily in the dark, and see quickly which end is the front (it can be hard to tell on roughly symmetrical lights like this one).
I really appreciate the UI here. On some more expensive EDC's you can get some fancier UI's like magnetic control rings or many programable choices, but the LM33 keeps it very simple. In general, I don't like UI's where you have to click a bunch of times to cycle through modes. However, one of the main reasons for that is that I'm frequently unsure which mode the light will come on in the next time I pick it up. By defaulting to low each time, I always know where I'm starting, and I don't have to worry about blinding anyone unintentionally. Starting in low may not be considered a "tactical" light, but for a lot of purposes this is going to be what you want. Just take this fact of starting in low each time into account when considering this light for the uses you have in mind.
There are just a few flaws I've found with the LM33 in particular. The first is that there is a tiny bit of battery rattle with some brands of CR123 batteries, though I haven't observed it with 16340 lions at all. Normally, this isn't too big of a deal, and you can just put a slip of paper around the battery as a spacer to secure an annoying rattle. However, in the LM33 I've found that rattling a CR123 battery can actually make the light turn off, and I'll need to re-rattle it a bit to turn it back on. I suspect that the mechanical anti-reverse polarity protect might actually be causing a short at times, if the battery slips over to touch both the lowered and raised portions of the head.
So, if this is the case, you'd need to be very careful about not leaving any CR123 batteries in the light when not using it, so that no short is possible.
The only other flaw I've found is that the output on high with a lithium ion seems to be significantly less than advertised (450 lm). I don't have enough data on my lightbox yet to make claims of absolute lumen output, but when I compare this to other lights (even same emitter in similar sized reflector) it seems to be putting out somewhere around the 200-300 lumen range. Lumapower has informed me that these lumen claims are "emitter lumens", which means they are calculated based on Cree's specs for what the emitter will put out when given a certain current. Soon Lumapower will be doing measurements of OTF lumens (what actually comes out the front of the light), and I'll post that data when I receive it.
Overall, I've found that this light fills it's niche well, and for a great price you can have a very nice light.
EDC
By naming this their "EDC" series, Lumapower seems to be suggesting a certain use for these lights. Every Day Carry means different things to different people, but for me I have a few things I look for when deciding which I want to have with me at all times.
First, I like that this can accept both rechargeable and primary batteries. I use rechargeables regularly to keep costs down, and I don't want to be too afraid of costs to pull out my EDC. However, it's important to me that in an emergency I can use primary batteries as well. For this reason, I really like the LM33 as an EDC, though I think it's bested by the LM31, which can accept either 14500 lion, AA NiMH, or AA alkaline. I really value the common availability of AA's in a pinch, and it's only slightly longer. But if you prefer extra brightness over battery convenience, the LM33 is going to be more your style.
Next, I want it to be easy to always have with me. The LM33 gets point for being very compact, but loses points on the poor lanyard and lack of clip. I don't use clips on most my lights, but on my EDC I want to be able to clip it to shorts or PJ's that don't have pockets. If a clip is a big deal to you, check out the LM21.
Also, it've important to me that my EDC have a good range of output. I want low available for most of the time, but I want very high available when I need it. The LM33 doesn't have super low low or super high high, but rather reasonable low and reasonable high. Plus, it's got a little extra throw compared to your average EDC.
On that note, the choice of XP-G leans this toward an EDC for a person who gravitates to certain tasks, namely, longer range. Up close, the tight spot of the XP-G can be a little too bright and the surrounding area a little too dim, but at distances the XP-G will do great. So generally, if you spend most of your dark time indoors, I'd suggest something with an XM-L for more flood, but if you spend more or your dark time outdoors, the XP-G would be a great choice.
Long Term Impressions
I'll fill this part in after carrying the light for a while. If nothing get's added here, either I find nothing else worth noting about the light, or I end up not using it often.
Last edited:
