Wiggle
Flashlight Enthusiast
Any idea how the XP-E2 would do driven hard in the Solarforce MPP-1 head?
Is the XR-E still the King-Of-Throw?
- Thread starter rayman
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BenChiew
Flashlight Enthusiast
I can tell you that the XPE2 will out throw and xpg2 any day. Given all remains equal. I have both triples, both having the same drive levels. Can't confirm if this is the case with xre.
CarpentryHero
Flashlight Enthusiast
Id ask VinhNyugen, he's really knowledgable
Yep.
BeastFlashlight
Flashlight Enthusiast
What does this mean? When u mention 'spill' being included in the TN31mb but being absent in the Deft-X are u referring to the far off target having a little bit of spill or are u referring to a little bit of complimentary spill close to the person holding the flashlight? Am I correct to say that (being both are 1.4 degrees) both lights when shined on a far off object provide the exact same radius of illumination? (1.4)
Up All Night
Enlightened
- Joined
- May 29, 2012
- Messages
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Spill is indeed a reference to the light that 'spills' out of the reflector near the user. The angle and brightness of the spill is dependent on reflector design and the type of emitter being used. It's an inescapable by-product of a light source being collimated by a reflector. An aspheric type light is the most efficient means of keeping light rays parallel(no spill & max intensity). Spill won't play a role at great distances but it may keep someone from walking off the edge of a cliff! Saab's photos of the 31mb & DeftX in his OSTS thread provide a great reference.
Yeah, spill is never relevant to seeing at long range, because its just the unfocused light that "spilled out" right in front of you because it missed being collimated, etc.
Spill is a curse in some uses, and a practical solution in others.
For some tactical scenarios, spill is cursed as it may illuminate your position/your buddies positions next to you to an opposing threat, etc.
For for long range illumination, too much foreground brightness can hurt your ability to open the pupils wide enough to make out dim distant targets.
For most other scenarios, the spill can sometimes be adequate to see where you're going, as the ground in front of you will have at least some light on it even though the beam itself might be aimed off at the horizon, up into the trees, etc.
The focused part of the beam typically has a hot spot, where the light is mostly tightly focused...and, that is what is able to reach the longest range.
The corona is the focused part of the beam that is not as tightly focused as the hot spot itself...a softer ring of light, like a donut, that surrounds the hot spot. This part of the beam can illuminate targets up to a certain range along with the hot spot, but, it falls off as range increases, so that eventually, only the light from the hot spot is illuminating distant targets. The corona makes the circle of light larger and more useful at intermediate ranges.
Spill is a curse in some uses, and a practical solution in others.
For some tactical scenarios, spill is cursed as it may illuminate your position/your buddies positions next to you to an opposing threat, etc.
For for long range illumination, too much foreground brightness can hurt your ability to open the pupils wide enough to make out dim distant targets.
For most other scenarios, the spill can sometimes be adequate to see where you're going, as the ground in front of you will have at least some light on it even though the beam itself might be aimed off at the horizon, up into the trees, etc.
The focused part of the beam typically has a hot spot, where the light is mostly tightly focused...and, that is what is able to reach the longest range.
The corona is the focused part of the beam that is not as tightly focused as the hot spot itself...a softer ring of light, like a donut, that surrounds the hot spot. This part of the beam can illuminate targets up to a certain range along with the hot spot, but, it falls off as range increases, so that eventually, only the light from the hot spot is illuminating distant targets. The corona makes the circle of light larger and more useful at intermediate ranges.
BeastFlashlight
Flashlight Enthusiast
Oh ok thanks that makes total sense
fyrstormer
Banned
Any emitter driven to produce the same lux (i.e. lumens per square meter) will throw the same distance. Wider emitters merely produce brighter spill as well -- light emitted from the center of a wide emitter will behave exactly the same as light emitted from the center of a small emitter. Wider emitters may "waste" input power by producing brighter spill, but newer emitters are so much more efficient that it hardly matters in any practical sense. If the XR-E were still being updated with the latest in efficiency-boosting technologies, then it would still be the "throw king", but that isn't the case.
The_Driver
Flashlight Enthusiast
This is only the case, when you only consider emitters that stil have their dome lenses. The 90° emittance angle of the XR-E with dome lens is its only advantage. When de-domed only the lumens/square millimters (size of die) counts.
Here is a nice example: Deft Clone > XM-L2 > 4,2 Ampere >> over 550.000 Lux
Even though the led is 4 times as big as an XR-E ist still produces 3-4 times the lux of the original DEFTs with XR-E LEDs. 4,2A is only a moderate overdrive. In the DEFTs the XR-Es were driven at 1.5A-1.8A.
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