In my estimation, it seems ~22.5% of base pump radiance is converted to heat via phosphor film for this luxeon 5700k, even though photon qty is essentially maintained. I need to correct and use a different term than electrical effeciency. Effeciency is energy out over energy in, so the effeciency metric I've been describing is not exactly total effeciency because it's not accounting for phosphor film energy losses, it's only describing the electrical effeciency per base pump photons created.
I used the luxeon color line to come up with the 22% figure.
View attachment 4376442
According to the data sheet a cool white L1SPCW90002000000 pushes 1.57μmol/J at typical/nominal.
According to the data sheet the deep red L1SPDRD0002000000 pushes 2.65μmol/J at typical/nominal.
View attachment 4376448
Looks like peak base WV are ~455nm for the cool white, & ~664nm for the deep red.
455nm/119.6 = 3.80μmol/J
664nm/119.6 = 5.55μmol/J
455nm cool white:
(1.57μmol/J) ÷ (3.8μmol/J)
=
0.413; or
41.3%
663nm deep red:
(2.65μmol/J) ÷ (5.55μmol/J)
=
0.477; or
47.7%
When comparing these effeciencies to a different and trusted source, I get..
"
455nm cool white = 32.0% effecient
664nm deep red = 47.9% effecient "
It seems to me that the 0.4% difference (47.7% ÷ 47.9% = 99.6%) on the 664 nm deep red was due to the SPD of the 664nm not being symmetrical (amoung other roundings etc), and the 445nm cool white had a 22.5% reduction in effeciency (32.0% ÷ 41.3% = 77.5%), or a 22.5% reduction in [(mW of total radiant output) vs (mW/μmol of base pump)], and due to the losses on the phosphor film. For this 5700k example it looks like ~22.5% reduction in total effeciency due to phosphor film losses.
This could explain the discrepancy I've been having with Samsung saying 3.0+ μmol/J ( I calculate 79% effecient in base pump of 455nm) despite the effeciency from the trusted source giving a much lower effeciency (~70% effecient). Aha! I thought they were just lying through their teeth..
Maybe, phosphor film losses scale linearly with CCT & CRI, but idk, would be useful info, most SPDs of like CCTs & CRIs are pretty similar company to company.
In conclusion, it seems you can calculate a monochromatic LED chips total electrical effeciency, via its measured μmol/s output and its peak WV, but, using this technique for white light requires an additional phosphor loss be added to the the electrical effeciency per base pump photon created (I'm dubbing it the "base pump EE") to finally arrive at a "total electrical effeciency".
@alesh I couldn't message you, says you're locked up like fort Knox lol, hmu sometime..
