For sale is a heavily modified Defiant 51 LED flashlight. Yes, it's the same host and emitters as the 26650 version but further modified to (hopefully) please a larger demographic.
The stock guts of this light are useless for anything and were immediately discarded. In their place I put a large aluminum heatsink with three XP-G R5 emitters thermally adhered. The optics are the 50 mm tri-optic available from Fasttech.
The emitters are wired in parallel and driven with an 800ma 5 mode boost driver from Fasttech (SKU 1127407). I have been playing with this driver with different voltages and battery types and it seems quite versatile if one is willing to play outside the published specifications. This combination will run off one to four AA batteries as well as 18650/26650 or a single alkaline D cell. This driver starts on high and has no mode memory. Sequence is H-M-L Strobe-SOS. Emitter current is difficult to predict with a boost driver but tailcap currents on high are as follows.
Four AA-3 amps
Three AA-1.5 amps
Two AA-0.5 amps
One alkaline D cell-2.2 amps
26650/18650 - 3 amps
Given the above measurements I suspect the driver gives direct drive above a certain voltage. Alkaline batteries of course will not keep up with this draw for long. The best battery set up might be three Nimh in a 3AA holder. The driver is seated in a p60 pill which is glued to the back of the heat sink. The photo below illustrates the situation but with a different driver.
This version of the Defiant 51 host is moody in terms of accepting 4 eneloops in the stock battery carrier. You can do it but might end up with damaged battery wrappers. Four alkaline AAs are a good fit and the stock 4AA carrier is included. No resistance mods have been done to the carrier or tailspring as I think we want some resistance when using 4AA. A spacer for 26650 use is included. I ground off the crenellations on the bezel,filed it flat and stripped/polished it.
This light is bright but without emitter current I would not like to estimate lumens. The beamshot below shows the Defiant on the right running off 4 AA Aalklaines and a 3.85 amp XM-L2 U2 1C on noctigon in a smooth P60 reflector on left. Lights are 2 meters from the wall.
The building across the street is about 60 yards away.
About 30 yards to the pear tree.
Price is $30.00. Shipping within CONUS is included in the price. International buyers will pay actual shipping minus the cost of CONUS shipping. First thread response of “I’ll take it” followed by an IM gets the light. Payment will be via Paypal.
Thanks for looking,
Brian
Edited for specs resulting from additional driver mods.