BLF recoil über-thrower

EasyB · November 29, 2016, 7:57pm

EasyB:

Enderman:

Jerommel:

But then i still don’t understand why an aspheric lens out throws a forward reflector light… :question:

Mostly due to how the distance from the LED to the lens surface is longer than the distance from the LED to the reflector surface.
Since the distance is greater, the “difference” angle of light coming from the LED is smaller, leading to less divergence.
That’s also the reason why outer parts of a reflector (farther from the LED) collimate light better, like in that image by djozz which I can’t find atm lol

An aspheric light will not significantly out throw a reflector light (all other things equal). The lens will have a little bit more active area due to the “dead” area in the center of a reflector, but this is not usually a large proportion of the total area. There can be variations in reflector quality (shape and reflectivity) that could cause some differences. They should throw pretty much the same because of I=LA and the fact that the LED luminance is constant at different emission angles.

A C8 vs the Ultrafire UF T20 or Uniquefire UF 1505 is a good comparison because they all have the same bezel diameter. The C8 throw is well documented. I could not find many reports of throw in the aspheric lights, but maybe you guys can…

A couple examples to show equal diameter lens and reflector lights are usually pretty close:
UF T20 with dedomed XPG2: 135Kcd

C8 reflector with dedomed XPG2 S4 2B does 170-200Kcd
The T20 lens might have a bit smaller effective area than the C8 reflector.

The Convoy L6 SMO reflector is close to the same diameter as the UF 1504 lens.
DB Custom put a dedomed XPG2 in this light and got 439Kcd.

A UF 1504 will do 450-500Kcd with a dedomed XPG2.