These are DTP MCPCBs, E21A/E17A don’t have a thermal pad so you can’t use those (unless you have a grounded cathode driver and DTP the cathode but that’s a special case and even then only one side will have good thermals). They have a poor thermal conductivity dielectric layer and will perform badly. Virence’s MCPCBs have a very thin (relatively) high conductivity dielectric layer.
Yes they can do similar non DTP MCPCBs, up to 8W/m.K dielectric (they don’t detail the thickness) and apparently up to 3oz copper pours. Must be very expensive though.
Does anybody have a copy of Maukka’s table with all the measurements ? it’s not accessible anymore, I’m pretty sure I had it saved for offline use and yet I can’t find it in my Gdrive : This one
He hasn’t been connected for 10 months, I hope he’s well and just has other interests. Has anybody got in contact with him since then ?
Damn. I thought I had a copy of it but can’t find it. A ‘take-out’ version might be on my other encrypted drive partition that I seem to have forgotten the password too :person_facepalming:
we build grow lightstrips with the Opti 5k and 2k to get 99+ CRI, im guessing we could shorten up the duv with more 2k
Parameter Value
CCT 4615 K
Duv –0.0016
CRI (Ra)(R1~R8) 99
CRI (Re) (R1-R15) 98
CQS 99
TLCI (Qa) 98
GAI 89
TM-30-15 Rf 98
TM-30-15 Rg 100
We are more interested in replicating sunlight than delta’s but an interesting discussion
cheers
A tint mix will result lower R9, looking at the extreme example for 6500k+2000k you can see a big peak in the red part of the spectrum.
I think that the low R9 you encounter in single LEDs would typically, if not always, be due to a dip in the red part of the spectrum because red light is least efficient to produce.
So you end up with low accuracy of red for both but with caused opposite ways.
Am I right thinking the tint mix would give over saturated reds with more ‘pop’, which some could find more subjectively pleasing despite being less accurate, just like a negative duv?