Got a message back from Digikey again. And good news!
Great for the FW3A groupbuy, but not too great for smaller buyers.
For individual samples(less than a reel), the tint bins are randomly available from T6, TA, T7 and TB. No wonder the LH351D from Bob Mc Bob looked so green.
For a 1x reel LH351D (like our groupbuy), the only tint bin confirmed and available is T6, so way better than the 2nd and 3rd batch of LH351Ds, so about as good as the 1st batch from AEDe, but still not the godly T2/T4 bin.
HOWEVER, for 4x reels of LH351Ds, the tint bins are confirmed and available in the T4 and T6 bin, and the T4 bin is way below the BBL and closer to 3900-4000k rather than 4100k-4000k according to the Digi-Key rep. That is very good.
I’m not sure the Digi-Key rep got the color temp for T4 quite right. Looking at the datasheet and trying to scale the chart on page 10, here’s how I read it:
T6 should be 4000K to 4125K, and Duv roughly +.002 to -.004
T4 should be 3750K to 3875K, and Duv roughly .004 to.010.
It looks like there could be a choice to make between rosier tint at a warmer color temperature versus a color temperature with broader appeal plus 20 lumens and a chance of just enough of a greenish tint that discerning users might notice.
As a related reminder, Maukka seemed pretty happy with a Carclo triple-equipped light he modded with LH351D’s (TC bin?) that measured at +.0036 Duv (assuming “medium” is the closest condition to the binning conditions of 1050mA).
I also would prefer below the BBL, but I’m being open-minded because I know some people have stronger feelings about color temperature than I have about small positive Duv values.
What encourages me most about Maukka’s testing of LH351D’s with a similar or worse Duv than a T6 should have is he saw limited tint-shift across the beam in a Carclo optic. Find a rainbow beam more distracting than slight deviations from the BBL.
Yeah its very green corona/hotspot that is the worst. I can stand above BBL if it’s consistent across the beam (and the CCT doesn’t shift too much either).
I’ve been pretty happy with the 4000K LH351Ds I got from Mtn-Elec that I put in my Q8. Don’t have any idea what tint bin they are but less green than a lot of Cree emitters I’ve seen that weren’t specifically binned for on/below BBL.