Sorry about that AEDe, can’t do nothing about it.
I described it earlier when the final product arrived (with pictures too). Of course the prototype finishes were much better since those were made using CNC router ONE by ONE. To cut down cost the final product incorporate V-score for easier/cheaper machining and faster cutting rate (hence the flared outer edges). And FYI, those prototypes actual cost was USD 38,5/pc, and I ordered 60pcs.
I guess for flashlight modding hobby, deburring and lapping the MCPCB can be considered as a routine. I do small batches of streetlights using those boards and still do the lapping too (for the MCPCBs, not me). Those flares can be fix fairly easily using #1000 sandpaper on flat surface.
Clemence, have you ever considered making an adapter for mounting e21s on standard 3535 boards? I mean a 3535 sized very thin two sided board with 2 contact plates on one side (just like one on your quad boards) and 3 standard contacts on the other side?
These would be useful for standard triple/quad light engines
That would be very inefficient in terms of performance, cost, and form factor. Easier to just cram three boards closer. The next plan would be triple board.
Btw, make sure you clean the flux residue. At higher current the residue will thin and wet the LEDs sides. When things gets hotter, it will cause phosphor burns.
Boiling IPA and nylon brush is all it takes
Isopropyl Alcohol. Usually available at the drug counter in 70% - 95. Higher concentration doesn’t seems to work any better. IPA needs water to dissolve fats such as solder grease/flux residue. I bought 95 just to save money. I added 50% filtered distilled water taken from my air conditioner condensation (It’s very humid here at 88-90%, I usually got ~20 liter distilled water per day).
Nice, I’m planning the same on my wizard, but with a pretty wild combo of emitters
2x 3000k + 5000k + 6500k. I’m curious how the resulting tint will look. Should be around 4500k I guess.
New VR16SP4 (alpha board) thermal test result from Jensen567:
At the same 5A the new board is 26C cooler. Peaked in ~6A (the resolution used was 500mA). Using my previous lux-current test result, the peak should be ~6,4A (3,1A/LED). As you can see from the phosphor temp result, the BLF max rating is 4,8-5 A in 2s2p config (2,4A/LED).
So if I ordered a VR16SP4 WITH 4 E21 SM403’’ and put them in a Convoy S2+ or S3 with a MTN 17DDm would I want to MCPCB set up as 3V, 6V, 9V, or 12V? I’m really curious to see how these would perform in a Convoy S2+ or S3 host with a high drain 18650.
I supposed the new 3, 6, 12V order received is yours. Only heavy OP reflector and pebbled/frosted/faceted TIR optics will work with the new quadtrix board. The extra gap made for maximum performance creates donut with SMO/plain tight TIR optics.
No wasn’t me, I don’t want to order until I figure out how I should set the LED’s up. Would it be possible to run these on a 8x 7135 driver at 3 volts or 6 volts?
I can’t comment on this since I never use/try any 7135 based drivers. As long as the drivers of your choice designed for 3/6/9/12V LED config it’s good to go. The max safe current limit (BLF max) for each configurations (using 4 x E21A) are: 10A(5,6A) for 3V, 5A(2,8A) for 6V, and 2,5A(1,4A) for both 9V / 12V. Lower values in brackets are OEM L70 50.000 hours absolute max.
However FET fot that configuration is not the best choice. I tried quad E21A with Lexel’s bistro-hd driver and it ended very fast, I saw 16A on clamp meter, then one of E21A died…
