Hey Simon, update on L21A with Osram emitter driven with 8A buck driver?
Oops, I should learn to read.
[quote=id30209]
Just gonna bump it again.
Looking forward to getting new 8A 22mm driver for my next mod
Would this 8A driver be good for driving low forward voltage LEDs like SST-20DR?
Quit opposite...
8 amps for sst-40 is safe?
Yes, from what I understand. Many bypassed the Astrolux FT03 and were getting upwards of 9A without any issues.
Just installed a KW CULPM1.TG into the L21A using Convoy’s ramping driver with a 50E and it’s a purple hue. This is only 7.25 amps, I wonder if it’s already being over driven. Simon is using an 8A driver.
It’s very similar to the tint shift on an SST40 CW.
My fault, the reflector was shorting on one of the wires. There’s still a little tint shift but that could be entirely normal.
The beam has multiple rings around the hotspot but only noticeable inside.
I was thinking of 3x SST-20DR or 3x XP-G3 Photo Red on Convoy S12 with this driver.
Since it is a buck driver, it should create less heat than linear FET or AMC7135s?
Okay, so a 50E achieves 7.25A and gets 1135 lumens at 30 seconds. Now if using a 40T at 8A I get the same lumens. Djozz told me that 7A should be the limit and it looks like he’s correct by the numbers I’m seeing
I’m not seeing any improvement over the 1mm version
Turns out I damaged the led at the beginning when I shorted a wire on the reflector turning purple.
New led at 7A gets 1300 lumens. Increasing to 8A only gets 13 lumen gain. I’ll be driving these with a 50E in Convoy’s ramping driver for 7A
Any update on Convoy STB 90.2? What amp driver will this be paired with?
I want to compete with Noctigon K1 which costs $139.99.
It still won’t get the same throw unless it’s installed in the L6
Hello Simon,
Can you confirm battery tube diameter for L21A? Is it 22mm or just 21.5mm?
I just measured and the inner diameter is 21.9mm which is mostly likely 22
96% efficiency, little heat generation
18A for SBT90.2
the host is in production
Some are 21.5mm ,some are 22mm
Can I specifically ask for 22mm, if I make an order?
I would also ask another request:
Could you please make a new item in the store? Which is same to this: 40.38€ |Convoy L21A mit luminus sst40, kupfer DTP bord und ar beschichtete innen, Temperatur schutz management, bis zu 2300lm|Taschenlampen| - AliExpress , but with these differences:
- emitter choices should be: Samsung LH351D 5700K, 5000K, 4000K
- driver max current: 5A (but other driver specifications are the same)
Yes, but the SST-20 DR has a very low forward voltage which you need to use a special driver. If you use this driver it’ll burn through most of the battery voltage very quickly to run more efficiently at a lower voltage.
If it’s actually an 8A buck driver the excess voltage is not wasted. However, a true 8A buck driver will require a very large inductor and probably be quite expensive compared to most Convoy drivers so I wonder if something is lost in translation here…
Okay, I’m not really familiar with a buck driver. There’s a thread all about the different types, I should go have a read up