So I’m kind of a noob, I just did my first “mod” (a straightforward driver swap) last weekend.
I just got qty=4 of the Nichia 219CT 4000K 9050 from WWEFANS thread.
I read djozz’s test of the 219C here . The unique thing about the 219 seems to be the low Vf, which djozz mentions could be problematic for FET lights. (Correct me if I’m interpreting that wrong).
I’m currently considering putting one in a C8, and three in a S2+ triple.
Do I need to use linear/7135*x drivers for these LEDs? I’d like to squeeze out a bit more juice than the standard 7135*8 at 3.04A, since djozz’s testing shows the 219C puts out a solid 40% more lumens at 6A. But 7135*16 seems… unwieldy. And of course, more effort and $.
What if I used a FET driver but just used a lower discharging cell like a Panny NCR18650B and did not bypass any springs, to intentionally limit amperage?
Or should I just quit trying to optimize everything and use a standard 7135*8 Qlite driver and be happy with my 900 lumens of 4000K 90+CRI goodness?
If you want to drive it the LED will get about 3.4-3.6V at 3A
that seems to be a normal voltage for DD
if you want to run it at 6A the cooling of it will become a serious issue if its not good enough the LED gets toasted
to limit the current at DD its better to add a small resistor
if you want to get 0.5V drop at the resistor at 3A you need 0,166 Ohm 1.5W
for a DD at 6A you may only need a voltage drop of 0.3Vso 0,05 Ohm 1.8W
its good to have some more values to experiment till you got the current with the cells you got
I’m sure you’re aware sac02, that you need copper DTP for that kind of stuff. What you wrote is pretty much how it is in my head (me noob). Using FET + 30Q and bypassing springs (could) lead(s) to a fried 219C. So my guess is that using GA and not bypassing springs should be sufficient; 18650B if you want to be safe. This is how I look at it. But like I said, I’m a noob, and others are more qualified regarding this topic :-).
Lexel, I’m not too worried about heat - I’m not planning to use the high/DD mode regularly, it would be more of a show-off / rare use scenario. Plus the C8 has more mass than smaller lights like the S2/+/3/6/8 that regularly handle strongly driven LEDs if used judiciously. For the S2+ triple I’m thinking maybe a 2.4A driver.
hIKARI, yes I would be using a copper DTP MCPCB,probably a Noctigon from mtnelectronics.