This modified flashlight consists of a SureFire C2 flashlight with a M2 head. A Luxeon

5W Cyan LED is driven by a "BadBoy 750" circuit by Wayne Yamaguchi. The original

lamp assembly was cut in half and became the basis of the new LED module.

The spring contact end was retained for electrical contact with the + terminal on the battery

as well as ground path through the body. The reflector was bored out to allow for the LED

to pass through and into the focal area of the reflector. On this particular modification, I

used a threaded coupler attached to the reflector to allow for adjustment of positioning the LED

within the reflector. Once the best compromise of beam pattern was determined, the threads

were epoxied with arctic silver epoxy to hold the focus adjustment as well as provide a thermal path

from the LED to the outside flashlight body and head. The circuit board resides within a cavity

machined into the backside of the primary LED mounting block/ heat sink base. An additional

reflector collar was made to increase the aluminum mass as well as span the void between LED

module and the bezel. The collar was epoxied onto the LED module and the completed assembly

loads into the bezel from the front, lens, end. Arctic silver thermal conducting grease was applied

to the collar as well as the interior of the bezel.

The reflector provides a combination of a relatively bright center hot spot as well as a

wide angle beam of low level light.

In the beam shots above, on the left is a beam from the brightest 1 Watt Luxeon flashlight I own

with the Cyan beam to the right of it. The intensity of the center hot spot caused a white image

to occur in the photo. In reality, the center is an intense cyan color very comparable to the color

shown in the photo. Notice that there is a cyan halo effecting and surrounding the beam from the

1 Watt white Luxeon. The image at the right shows a slightly angular side profile of the beam pattern.

With a light meter approximately 1 foot from the light sources, the 1 Watt LED had a central hot spot

reading of 2840 lux and the Cyan registered 7250 lux. Using manufacturer provided collimator lenses

with the 5 watt Luxeons, a much wider beam is produced without a bright center, hot spot. The

beam on this light is not perfect and it contains some slightly darker areas as well as a "star" of

brighter light. These flaws are subtle and not easy to photograph. All in all, the beam is very

satisfactory and I look forward to seeing how this interesting color works in real world applications.

I have seen a similar color to this in viewing sandy bottoms in clear water in Hawaii. I wonder if this

frequency of light is possibly well suited to penetration through clear ocean water. By adding an O-ring

groove and O-ring to the collar, this light should be water proof. Might be interesting to take it on a

dive and view the mono-chromatic results.

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