Examining Samsung's 3.03μmol/J Claim

ChiefRunningPhist

ChiefRunningPhist

Well-Known Member
Do you guys know what luminosity function they use to build the data sheet? I've been calculating based off of the 2005 modification (Sharpe, Stockman, Jagla & Jägle -- tiny dots), should I be basing off of the 1931 CIE (solid line)?
Luminosity.svg (1).png
 
R

Richelsdorfite

Well-Known Member
ChiefRunningPhist said:
So which one is it? 68% or 80%?


Well I've since remebered lol Dammit! The discrepancy is due to 1 metric describing the power input vs the energy emitted after the phosphor losses, and the other metric is describing the power input vs the energy before the phosphor losses.

When I assume a CE of 1, I get ~3.3μmols/J. The stated claim is 3.03μmol/J, so I'm assuming the CE for the phosphor film they are using is not 1 but something close to 0.918. I'm going to wrestle a little more with this.
Click to expand...
Using the datasheets for LM301H (70-80-90 & ONE) and using the following values for the electrical input:
- 2,7V
- 0,065 A

I found, using the average values for lumens output for each color temperature and each CRI the following data:

LM301H.png

So I think that the correct efficiency values are around 55% to 70% function of the cat. of the led.
 
R

Richelsdorfite

Well-Known Member
ChiefRunningPhist said:
Do you guys know what luminosity function they use to build the data sheet? I've been calculating based off of the 2005 modification (Sharpe, Stockman, Jagla & Jägle -- tiny dots), should I be basing off of the 1931 CIE (solid line)?
View attachment 4442341
Click to expand...
I use this one:
VM(?) 1988 Spectral Luminous Efficiency Function for photopic vision > https://www.rit.edu/cos/colorscience/rc_useful_data.php

From which I made this file to extend the curve to 800nm:
 

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