clemence is the master of TiR and cherry picked the one he put on the JetU, I dont know his secrets, maybe ask, or maybe contactcr already can tell you…
Digi-Key “dog fart” arrived. It’s almost identical to the Arrow one tested except for about 100K higher CCT ~4800K instead of ~4700K. Duv is otherwise the same.
How does the LH351D 90cri compare to a nichia 319A (80cri) in terms of efficiency and beam pattern? Thinking about swapping to a higher CRI LED in my Quark Mk III…
the higher CRI LED will be less “efficient”, inasmuch as it will produce less total lumens
CRI, and especially CRI R9 go up at least as much as lumens go down
imo, it is worth the trade.
now, depending what CCT you are interested in
there may be reasons to choose 219b over LH351d or SST-20
Im not sure yet, which I would prefer, have not tried the SST for example
I do like the Nichia more than the unsliced LH351d…
for my pink biases the LH351d needs to be sliced,
that also comes with a lumen penalty
If the die of the 319A is close to that of the 219C, the LH351D will be floodier but probably still have more output/be more efficient even binned at 90CRI. The LH351D has a die size right between the XP-L and XM-L2 IIRC.
I’ve actually become quite fond of the 4000k sst-20 but I believe those would be even less efficient than the LH351D. I have a few lights with that and while the r9 does lack a bit it seems overall quite nice. I’d really like to keep this as bright as possible and the 319 is doing alright for now… just love my high cri options!
I think you might have a 319a D340, if thats true, and you go to a sw45k D220… you would see a 35% lower output… sounds like you might not like that… but
let me play CRI advocate…
say your light makes 340 lumens now
and with a sw45k, lets say it “only” makes 220 lumens
the low CRI is only 54% brighter… that is not really a big visual difference
and you give up all Red rendering… to get those extra 120 lumens… is it worth it?
you know best…
lucky for you, that version of the quark is not glued… tinker on!
The Samsung LED still has better cri and r9 than the natural light coming in my office today:
Two measurements taken in Texas, today at 2:45PM, overcast day. First is indoors with no artificial light, only ambient light from window - the next measurement is when I step outside.
Here it is sliced in a Sofirn C01S AAA small TIR on the “100 lumen” setting. Not exactly apples to apples but you can see lower DUV but not much change in CCT. I cant explain why that is, maybe LED tint variation but probably just the optic doing strange things. It’s not really meant for such a large die. There is also a little ambient light in room.
The 2700k and 3500k were always the best ones so I’m not too surprised by this.
We have seen T6 be above bbl from other vendors so it seems like these squares if meaningful generally tend to be at the very top of the square/bin
Side note; CONGRATS on getting one of these mega distributors to answer this. Didn’t think it was possible.
If I can muster up the energy I’ll test my Convoy sourced 5700K 351D tonight or tomorrow. Don’t think we have seen one of these in the “wild” yet. I think these were from some stadium lighting so I suspect mega green but we’ll see…