Reflector hole is 7mm, and it seems like intl-outdoor sells 7mm gasket with white flat. yes those leds are connected in series. only thing i haven’t measured is space between reflector base and dct board, since i will need to solder some wires there to connect leds. i guess 22-20awg wire should be fine, will see.
hopefully experiment will be successful, i just want to narrow the beam and decrease the glare for inc traffic. previously i was modding BL70s with xhp35hi with aspheric lens, but beam intensity wasn’t enough so bought these lights instead.
I have also posted this in the L2/L6 modding thread, but this might be just the more appropriate place to ask
So i took the gamble and just ordered the L21a to build a nice thrower
Together with some high drain 21700 Shockli cells and the famous Led4Power 3030 MCPCB with OSRAM KW CSLNM1.TG and another OSRAM KW CSLPM1.TG
I am planning to keep the original driver, but still doubting which LED to use, @6A the 1mm might be just overdriven and the 2mm might be just underdriven.
That is similar behaviour to that of the 17mm / 22mm driver for SST40 (weird firmware, max 8A). One of my ∅22mm units stock delivered ≈7.63A, and another ∅17mm one (with swapped sense resistor for 5A, R010 + R050 + R200) was delivering 4.75 - 4.8A according to my precision PSU's amperimeter. In essence, 95% of rated maximum values.
The latter is paired with an CSLNM1.TG (1mm²) and I am happy with it.
BobbyMK if you want to push that a little bit more the math is easy. V = I × R = 4.57A × 10mΩ = 45.7mV sense. Stack an R100 on top of the stock R010 and you should get 10% extra maximum current, 5.027A.
I use this driver in B158 and paired with the CSLNM.1 it has 370kcd throw, last time i measured without driver and NCR B battery to limit current it was about 380kcd. I think this is the sweet spot for this led.