A "dumb-head" build with a PR-T and R2H Luxeon for use on the L1:
A shortened E-can was used for cathode contact and a Delrin isolator holds a simple rivet with spring for
anode contact. A more refined system is certainly possible.
For some beam comparisons, this PR-T was viewed against the stock head using the NX05 optic as well
as another head hosting a R2H 1W Luxeon with a Fraen LP optic. Below is a "LOW" beam shot with
the target grid approximately 30" from the lights. The same manual camera exposure was used on all
three images. From Left to Right, Stock head, Fraen Optic and then the PR-T:
Below is the same line up with the lights on "HIGH" beam. The exposure level was adjusted for the
intensity of light present in the center beam of the Stock head and held for the other two images. A lux
measurement was taken at roughly 1 meter with readings, again from L to R of 190, 400 and 1320.
Due to the exposure levels, it is not apparent that both the NX05 optic in the Stock head as well as the
PR-T head provide a useable flood of spill light whereas the Fraen LP is essentially devoid of such.
The L1 shown above was further modified by having the battery tube "gutted" of circuit and bored out
to accept batteries all the way through. A pair of CR2 cells along with a short spacer are one such
combination. The resistor in the tail switch was replaced with a 33 ohm 1/4 watt resistor.
This pack will now host "smart" heads such as a PR-T 917, KL4 and even KL5 via an E2C adapter:
A delrin tail switch guard was made to replace the plastic switch boot jam nut. In addition to protecting
the switch from unwanted activation, the guard will also allow for standing the light on its tail for use in
hands free applications or indirect area lighting by bouncing the beam off the ceiling.
Upon further consideration, a modified and shortened E-can could be used to allow for 2x123 cells in
the L1 host. A portion of the plastic guide on the tail switch was removed to allow the switch to be
digested further into the tail of the battery tube and allow for final contact of the "High" mode. Below
are pictures of the short E-can compared to standard. The anode contact is moved forward to allow for
The two lights below both have 2x123 power. The PR-T has a Lux III with DownBoy 917 driver and
the full PR head hosts a 5W LED and BadBoy driver. Both tail switches have been modified with
33 ohm resistors as well as shortened isolating guides.
The Optic from a SureFire X200 was mounted in a modified PR reflector:
Beam shot from about 30"; auto exposure on camera:
Cropped portion for LED lit image:
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