I got the emitters from Arrow and reflowed them on Kaidomain’s 20 mm DTP MCPCBs.
I mounted the emitter on CPU heatsink with a nice splash of thermal paste and over the top 16 AWG wires.
I got two emitter types. They only differ in the flux bin with the MF being higer, but I took both to check if there’s a difference in tint. Spoiler: the KF was nicer, but MF has much higher output potential.
Exact order and bin code:
Most tests were done with the MF bin, which most people ordered since it was on sale at Arrow.
In the product code:
SPH=Samsung Package High Power
5=LH351C (A=LH351D, 3=LH351B)
G=CRI min. 90 (C=70, E=80)
E4=Forward voltage bin 2.7-3.1 V
RT=CCT 5000 K
MF=Flux bin 250-310 lm, KF=230-290 lm at 700 mA at 85°C
CRI data measured at 700 mA from the hotspot with a
Yajiamei 10° beaded optics (MF bin)
Yajiamei 10° beaded optics (KF bin), nicer tint with less green (duv 0.003 vs. 0.005 on the MF)
Bare emitter (MF) at straight on (0°) for reference
Medium sized smooth reflector from the Eagle Eye X7 (MF)
CRI data with increasing drive current with the Yajiamei optics measured from the hotspot
Output measured in a 50 cm integrating sphere
At 700 mA I measured 306 lumens at 147 lm/W for the MF bin and 290 lumens at 139 lm/W for the KF bin.
The LH351C is rated at a maximum of 2000 mA and 2600 mA pulse current.
The MF bin I tested produced much higher output at high currents than the KF bin.