Hi, Need Help on determining actual Lumens of stock lights...

[Ian2381]

Need Help,

Can anyone give me an Idea for the Actual Lumens for some of my Lights.
My Fenix E20 is for sure rated correctly at 109 lumens(or near that) since this is a good brand but how about the Budget ones.

Solarforce L2 R2 - Utilizes a Cree R2 7090 XR-E LED

• Utilizes a Cree R2 7090 XR-E LED 0.8-4.2V on 2xAA and 1x18650

Romisen RC-G2 P2 1xAA

Akoray K106-CreeQ5 5 mode on 1xAA

TANK E07 on 1xAA

Just curious with the actual Lumens as to compared to output. :thinking:
Thanks.

 

[Gunner12]

You'll need a integrated sphere to get a accurate lumen output. Those cost a lot of money. Also, the E20 might not be 109 lumen. It's probably a bit more then 109 lumen at the LED, which, after optical losses, is probably at 90 lumen (guessing by the numbers I see tested from other Fenix lights).

Lumens is output, so what do you mean by the lumen compared to output?

 

[Ian2381]

Lumens is output, so what do you mean by the lumen compared to output?

I somewhat confused with some comments from other members with regards to some lights producing more lumens but other lights with less lemens being brighter, might be due to reflectors.:candle:

 

[LEDninja]

Send your lights to MrGman.

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Some educated guesses:

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There seems to be many models of the Solarforce L2 R2. I found 1 with the following info:
Circuitry: Digital Regulated 800mA Current Output
Brightness: 230 lumens maximum brightness (manufactuer rated)
-
R2 is 114+ lumens at 350 mA. Roughly double that at 1000 mA. 228 lumens. They only claim 800 mA so only 80% of the 230 lumen claim >> ~184 LED lumens.
Now most optics are between 65% and 80% efficient >> 120 to 147 OTF lumens.

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Romisen RC-G2 P2 1xAA (P2? When and where did you buy this?)
Most 1AA lights use 350 mA drivers.
P2 is 67.2+ LED lumens at 350 mA.
Applying our optical losses >> 44 to 54 OTF lumens.

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Akoray K106 Cree Q5
Most 1AA lights use 350 mA drivers.
Q5 is 107+ LED lumens at 350 mA.
Applying our optical losses >> 70 to 86 OTF lumens. (This would be the # for the RC-G2 Q5 from ShihingBeam)
-
With 14500 900 mA, 0.9*2*107 or 193 LED lumens.
Applying our optical losses >> 125 to 154 lumens.

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TANK E07 on 1xAA
Do not have a feel for the efficiency of the Osram LED. Think it is less than the latest Cree (Q5/R2).
90 minutes seem to indicate 350 mA but I think they claim somewhere 500 mA.
Less efficiency, higher current. I'll make a wild guess it is the same as a Q5 at 350 mA.

 

[PhantomPhoton]

I somewhat confused with some comments from other members with regards to some lights producing more lumens but other lights with less lemens being brighter, might be due to reflectors.:candle:

To put it bluntly, many manufacturers overstate the lumen output of their lights. Many simply list the theoretical maximum with 100% light transmission efficiency.
There are a few manufacturers however who have actual tested values and a couple who routinely understate their outputs ensuring that every light they produce exceeds specs.

Lumen output is incredibly difficult to test scientifically for enthusiasts like us.

 

[Ian2381]

Send your lights to MrGman.

----- ----- -----

Some educated guesses:

-----

There seems to be many models of the Solarforce L2 R2. I found 1 with the following info:
Circuitry: Digital Regulated 800mA Current Output
Brightness: 230 lumens maximum brightness (manufactuer rated)
-
R2 is 114+ lumens at 350 mA. Roughly double that at 1000 mA. 228 lumens. They only claim 800 mA so only 80% of the 230 lumen claim >> ~184 LED lumens.
Now most optics are between 65% and 80% efficient >> 120 to 147 OTF lumens.

-----

Romisen RC-G2 P2 1xAA (P2? When and where did you buy this?)
Most 1AA lights use 350 mA drivers.
P2 is 67.2+ LED lumens at 350 mA.
Applying our optical losses >> 44 to 54 OTF lumens.

-----

Akoray K106 Cree Q5
Most 1AA lights use 350 mA drivers.
Q5 is 107+ LED lumens at 350 mA.
Applying our optical losses >> 70 to 86 OTF lumens. (This would be the # for the RC-G2 Q5 from ShihingBeam)
-
With 14500 900 mA, 0.9*2*107 or 193 LED lumens.
Applying our optical losses >> 125 to 154 lumens.

-----

TANK E07 on 1xAA
Do not have a feel for the efficiency of the Osram LED. Think it is less than the latest Cree (Q5/R2).
90 minutes seem to indicate 350 mA but I think they claim somewhere 500 mA.
Less efficiency, higher current. I'll make a wild guess it is the same as a Q5 at 350 mA.

Thanks for a very useful information, Manufacturer rated Lumens is really over rated based on Values you gave. like the solarforce which is rated at 300 lumens which I really think is overated especially when comparing it to my E20 which is only 106 lumens. (used 2AA batteries for the solarforce since my order for 18650 has yet to arrive).

Do you have any idea what budget light that runs on a single AA has the most OTF Lumens?

 

[LEDninja]

Budget AA torches have 3 problems.
1) They use budget drivers, those designed for the Luxeon 1 LED eons ago. 350 mA max or the LED goes .
2) They have to work with budget batteries. Not NiMH, not alkaline but carbon zinc (dollar store Heavy Duty) which is why they do not use higher powered drivers. This is true for all AA torches so if you want a Brite Lite ..... 1AA is not the way to go.

Can you go with 2AAA. 4Sevens Preon vs. Fenix LD05 vs. TANK007 E06.
The pocket clip lets them sit vertically so are still pocketable. At 160 to 170 lumens are brighter than the 145 lumens of the latest Nitecores. They should match your Solarforce on 2AA.

Notice you have an Ultrafire C3. There are so many variants of the C3, you have to check the specs for yours.
If it says 1AA you are out of luck.
If it says 1AA/14500 buy a 14500 Li-ion battery. It will charge fine on your 18650 charger. Get the AW one. The Ultrafire and Trustfires are oversized and may not fit the torch. (My Ultrafire 14500 battery would not fit my Ultrafire 14500 charger!!!) Your lumens will double.

3) The budget lights lack QC. I am surprised you have half a dozen and no failures yet. I am also surprised others have not chimed in pointing out you have spent enough money to buy 1 or 2 good reliable lights instead of many iffy ones.

 

[Ian2381]

If it says 1AA/14500 buy a 14500 Li-ion battery. It will charge fine on your 18650 charger. Get the AW one. The Ultrafire and Trustfires are oversized and may not fit the torch. (My Ultrafire 14500 battery would not fit my Ultrafire 14500 charger!!!) Your lumens will double.

3) The budget lights lack QC. I am surprised you have half a dozen and no failures yet. I am also surprised others have not chimed in pointing out you have spent enough money to buy 1 or 2 good reliable lights instead of many iffy ones.

Thanks for the reply,

Yes my C3 stainless can use 1AA/14500 - Maybe I have to try and buy the higher battery type.

None has failed me yet and am pretty much happy with them but still wanting more.

If I buy higher priced once I'll probably won't use it and just display it in my room (can't imagine braking it or losing). So quality budget light is the best for me. That's why I'm seeking advise from this great forum.:twothumbs