I did this for science but the results are so similar i’m not sure it’s helpful to anyone. The hotspot appears to be ever so slightly less defined and edge of spill slightly cleaner. I thought the efficiency might go up but it appears to produce more or less the same lumens with both optics. I still think XP-L HI might benefit from this larger LED opening but i’m only going to try 219B.
Datasheet has support for other small-ish die emitters: XPG2/3, 219B/C, Oslon Square, E21A, LH351B
I was fortunate enough to stock up then, and I have about six lights using them. I still have some to spare for future projects, but I still get weepy thinking about my favorite LED being discontinued.
I think I’ll turn on my 219B sw45k Emisar D4 to cheer myself up.
I got my emisar d18vn with the osram white 2 mm… this light is perfect. No green tint at lower mode… I got 14740 lumen @ turn on. Amazing! Throw is 140Kcd.
When I first got the Emisar D18, I didn't have enough high-drain button-top 18650s to test the D18 with, so I used Sanyo NCR18650GA, which fortunately worked on the D18.
I have since then been able to get a few button-top VTC6, and re-tested the D18.
On an uncalibrated lux meter and doing a simple ceiling bounce test (with fully-charged 3x GA and fully-charged 3x button-top VTC6), the button-top VTC6 has higher lux reading.
Below are video beamshots of the D18 (but taken on different nights), using 3x raised-flat-top NCR18650GA, and 3x button-top VTC6
Yep - Captain Obvious. GA, and even better: Samsung 35E's are a great cell to up the runtime, lower the amps, though the 35E's in my experience do higher amps than the GA's. You could be pushing the GA and 35E cells rather high on the amp draw though which lowers the runtime -- funny how these tradeoff's work.
You'll see the GA cell doesn't lose much capacity when drawing 3 amps vs. 10 amps - yes capacity lowers but not a lot.
On 3 cells like the GA on the D18, speculating amps is 15-20 amp total (???), so only 5-7 amps per cell, which should be fine, and of course, only that much on max output.
Even if the draw is closer to 30 amps, still 10 amps per cell is good on short max runs.
I would want that. A cu+ti setup like the D4ti run would be awesome and I’d buy it immediately. You’re right though - it would certainly not be lightweight and other folks may not like that, so I may be in the minority here.