In my case I didn’t space it up, I machined my own bezel that’s a few mm shorter than the factory FW1A. I also had to machine the lower part (last ‘fin’) of the reflector off to fit within the head cavity.
Taking a second mcpcb, torching it until the top layers separate (doesn’t always work), then filing and sanding it smooth is an option to create your own spacer. Or buying copper discs from Bopper on Etsy is another (easier) option.
Yes. It’s a totally different driver and mcu. No markings and it’s small with ten pins IIRC, don’t quote me though. I’ll be tearing it down again… I did swap a Convoy Boost HX in. Throw dropped to 85kcd. Might try a 3000k SST20 next to see how it compares to my LEDIL IRIS in my ET G25C2.
Driver OD is 25.4mm. Cavity is 20.4 mm, so it mandates a 2.5mm ground ring. I wish it used the same driver as the X9L, I missed this detail and am kinda annoyed about it.
Just use an actual green emitter instead like Osram. At least the green will be consistent that way… :person_facepalming:
I can’t remember how bad they were. I know the 5790 when sliced basically down to the phosphor, the angular shift was fixed and the overall tint was very nice for a daylight cct. 4000k never got much attention, likely due to impossibly high duv. I might just need to refresh my memory.
Small with 10 pins sounds like what appeared on the new Convoy drivers, too. Some weird Sonix 8051 clone. The curiosity is killing me.
It does appear to be the same chip as Convoy. Good catch.
Not really much of a mod, but I have to share. I put a Zircon 803 filter in an SP36 with 4000K LH351Ds and got surprising results. I’ll just let the data speak for itself.
Does Ra = cri …?
Yes, CRI (or Ra) is the mean of R1-R8.
Wow, cri doesn’t even include the much talked about r9 … 
thanks! nice data capture
The zircon 803 has a 20% lumen penalty
the benefit is the DUV went negative… congrats on that
for reference, could you also post the same light without the -green filter?
what I like about the SST is the high R9… but I dont care for the green tint
the Lee filter keeps the high R9, and improves the tint… similar to the way slicing the dome of an LH351d does. But the LH351d is not a 90+ R9 CRI LED… and the green tint is as bad as the SST…
so I just ordered an SST light… though I may still mod to 219b, instead of using minus green filters.
That is why R9 is often mentioned separately.
R9-R12 are saturated colours and were all not part of CRI because CRI represents how natural colours look, not how saturated. They are important for good lighting though, and with leds the R9 (saturated red) is always the bottleneck so that is the one mentioned.
Okay that makes sense. I just thought it was discussed because it was always lacking…
With the Zircon 803 installed over the LH351Ds, R9 came in at 96 as you can see in the data above. That’s what I found most impressive since the LH351D typically comes in around R9 60-70.
I’ll retake measurements without the filter when I get a chance.
thanks for clarifying, I was confusing SST with LH351d
that IS a big jump in expected R9 for an LH351d,
great visuals, love your color graphs
| CCT | Duv | CRI | R9 | ||
| C8+ 351D 4000K | Without filter | 4200K | 0.0039 | 91 | 70 |
| C8+ 351D 4000K | With filter | 4060K | –0.0019 | 97 | 94 |
| D80v2 351D 4000K | Sliced | 3800K | 0.0012 | 93 | 77 |
Edit: added D80v2 with sliced LH351D
outstanding results, never expected R9 to go up by 34% from using an 80% transmissive pink filter. (minus green)
great info… you are the first to ever make me aware, of the strong positive effect of Lee Filters on R9.
thank you!
I generally see +10~20 pts of Ra with 803, 5~10 with 804.
This LH351D 4000k with +24pts is indeed significant but don’t expect it to always be that high.
Of course, it’s not really increasing the output of R9. Rather the filter is just reducing the output of all the other colors so they match the R9. Result is in a CRI test, R9 rates higher.
Filters do have some disadvantages.
Do the filters last forever (like for several years), or does their effectiveness change with time (even when not in use) or from using the light for hours at a time?