Nichia 219C, testing a 5000K 83CRI emitter, comparing with a XP-G2 S4 2B and other leds

^ Good point. Since that TN31 driver is also voltage limited (on output), maybe the higher Vf of the XM-L2 was restricting current.

I will check that out when I go into the light next time. Might be this weekend.

I can say the 219C with it's dome created a nice beam profile and tint. Throw was not stellar. It measured some where around 150 - 160kcd (I think it was 156), but I didn't put any effort into focus. Just wanted to get a general feel for what it would do.

That shows the 219C really has low enough forward voltage to get as much current as one wants with one cell. Time to stack more 7135s on a Q Lite. Direct drive turbo is for Crees!

It sounds like the 219C should do okay with a FET as long as it only uses low-amp cells like the NCR18650A. I think. Does this sound right?

I want to put one in my CNQG brass 18650, but it only has room for a single-sided driver… so that means 4x7135 or a FET+1. Does a FET+1 and NCR18650A sound like a safe combination?

Nichia did an evil thing: stacking is back from the grave :evil:

BTW, where does all that extra voltage burn off… in the FET itself? In the emitter? Somewhere else?

With DD drivers extra voltage is burned off in LED,since DD is just low resistance switch;with linear drivers extra voltage is burned off in driver itself.

Just did a very quick and dirty check with a 219C, FET driver and a NCR18650B at 4.12V: 5.45A

I put a 219c into a 1504 with a 16x7135 Q.lite and it pulls 6A with ease from an Efest Purple 3500mAh 26650.

Excellent work, btw! From the beamshot earlier you posted, looks like the 219C doesn't tint shift much when de-domed.

Is this the same one you reported earlier with the SS collar? It sounds like it would do the same on a KK cell. I can fit the KK 26700 cells in my 1405's - the 26700's have high capacity and pretty good low resistance.

What's the SS collar? I recall discussions - can't recall if it helped much. I tested one hand made by O-L way back but didn't get any noticeable improvements.

Yes, same light from the earlier results I posted. The SS collar adds about 20% to the output from most of my testing.

Thanks! That sounds pretty feasible…

Should end up at around 1240 emitter lumens, according to the chart. Close to the maximum but, more importantly, on the left side of the output curve. So I think the main remaining issue then would be heat, with is a bit easier to deal with. I may even use this as a testbed for thermal step-down features on an attiny25. In such a small driver cavity, the MCU should have a relatively easy time sensing the pill temperature, especially if I cram in a thin piece of thermal-conducting foam.

We are back in regulation.

I reflowed 3 of these on a (slightly well used) triple board.
I will see this evening how much they draw from a FET driver and a 25R :wink:
Ok, I measured the triple at 12,8A with a fully charged 25R and at 10,8A with a fully charged 18500 IMR Efest.

Finges, I’ll place my chips on the “north of 15A” slot on the wheel. :wink: Should be impressive, wherever it falls…

Hi,

same plan here, so i am really interested in your result :wink: Just have to wait for the MCPCB …

Greetings

Kenjii

Maybe the LD-2 with the correct value of flea sized resister installed is the best option?

I think you mean slave boards are back from the grave :wink:

That’ll work with some lights, but I’m not sure something like the 1504 has enough depth in the driver cavity to easily add a slave board.

Ok, I measured the triple at 12,8A with a fully charged 25R and at 10,8A with a fully charged 18500 IMR Efest.

Very cool,

I’d expect an Efest Purple or LG HE-4, Samsung 30Q, to do higher than 12.8A. Hence my 15A wager…

Still, very impressive lot of output in a High CRI rendition, no doubt! :bigsmile:

Edit: Assuming you did spring bypasses, right? Through board on the switch? What size wires did you use? I’ve taken to using 18ga for these projects to allow every possible bit of current to flow. 16 ga if I can fit it in.