They’re using different angle beaded TIRs. Lost track on which one’s which because of all the swapping. All I remember is that the e21A 4000K uses Yajiamei 60° and the SST20 4000K 20° beaded from Convoy Store. The rest are either 38, 45 or 60°.
I got the LH351D 4000K from Led4Power. Not sure from which batch its from. It’s a little bit green when compared side by side with E21A or even SST-20 but its ok with me and I don’t notice it in actual use. I might try some LEE Minus Greens when they arrive.
I don’t have SST-20 or E21A 3000K yet but I do have some arriving so I’ll try to compare later. I do like the tints of these LH351Bs and don’t find them greenish or yellowish at all. But I do notice that I have a little bit higher tolerance going above BBL compared to a few very sensitive people here.
Part number breakdown for those who are curious. The order code will typically have the last six digits F4RTS6, which covers a relatively broad range of forward voltage, color temperature, and output ratings.
There is also a reel specific code that refines those last 6 digits: F2R1S2
F2 = 2.8-3.0V (good)
R1 = Tint bin straddling the BBL, 5000-5300K (good)
S2 = 380-400 lumens at 1050mA (fair)
Are you still planning to offer LH351D 3.000K 90CRI? I would be very much interested into some of these, e.g. for a nice triple individual of 3.000K/4.000K/5.000K. :-)
Thank you for the measurement. This result is resembling to a Nichia 219C of the same CCT regarding Ra (R9 could be a bit better, R2, R3, R13, R14 seems to be marginally weaker, R12 is marginally better) - which is a good result considering, that LH351D has better efficacy, than 219C.