Decided To Send My L3 Illumination K40 To Vinhnguyen54

[photon1k]

@Tom E

@ImA4Wheelr

Thanks for beam shots ILIKE! Regardless of measurement numbers, that Vin modded TN31 of yours is a beast. Looking forward to hearing/seeing the results of the K40 mod. Do any of you have a recommend distance to measure lux on the TN31? Mine gets about 347K at 10ft and 381K at 23’9”. The 10ft measurement was on freshly charged cells. The 24ft measurement was on the same cells, but after a couple weeks of off and on usage. I believe I’m over 5, but under 6 amps to the emitter. I need to remeasure. I was having issues the day I modded and measured.

I’m gonna spend more time on these - I’m working on 2, my own and another. I just measured 5.2A at the LED, 2.4A (7.2) at the carrier on one setup. I measure kcd at 4.3 meters and it’s definitely not long enough - I’m pretty much always low. You really want to be at 10-15 meters, and after that probably doesn’t matter. Crap - if you went from 347 kcd to 381 kcd, then my 385 kcd measurement at 4.3m may be more like 420-425 kcd which I’m like’n . So, this is say’n 6.5A can certainly achieve the 480 kcd #, or in that ballpark. Of course the TN31 does get that nice warm & cozy feeling at the base of the reflector, which I’d expect for sure. Really would like to get some copper or more alum mass there somehow, but I think it still does quite well considering.

At 5 amps, even a Shocker warms up nice…

Sorry ILK, hope I’m not de-railing your thread! I love your pics, very useful!! I got a K40 on order from the group buy, and since internally the K40 and the TN31 are the same, the same mods apply to both.

From his thread on throw:

@DrJones

Most of you already know that measuring the spot intensity at only 1m distance is not a good idea, as the beam often has not settled to it’s ‘final beam pattern’ in that short distance. Even ANSI/NEMA FL1 demands a minimum distance of 2m; for throwers that is still much too near (I suggest a distance where the spot size is at least 10 times as big as the reflector/lens diameter). Doing so and calculating that back to “lux@1m” sometimes leads to strange units like “31736 lux @1m (calculated)” - just write 31.7 kcd instead.