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Topic: Best way to calculate output color for cheap eBay RGB LED given Lumen+wavelength (Read 2034 times) previous topic - next topic

TECH GEEK

What is the best way to calculate output color for cheap eBay RGB LED given typical Luminosity & Wavelength?
I could also use a program that calculates it that I found online called, "chroma photonlexicon". (Google it)
However, the program was designed for laser combination, (ie. a RGB laser) and therefor uses Wattage as the only unit of measurement for the power variable associated with each color being combined.

I'm likely going to end up being told by grumpymike, or more likely greynomad/retrolefty (as they tend to be more active this time of day)
how to calculate the Wattage used by an LED, and it is probably going to be in the form of a formula and told to calculate myself....

Whichever way it is, Thanks for taking your time to educate me...


As always... Thanks for posting!!!

retrolefty

Quote
how to calculate the Wattage used by an LED, and it is probably going to be in the form of a formula and told to calculate myself....


Well I'm here but probably not too useful for your question. One thing I would be pretty certain of is that wattage consumed by the LED would not be the key input specification needed as that wouldn't account for the efficiency value of the led to converting electrical current to light output, and I would suspect that the individual led colors might even have different efficiency values. I suspect a good typical RGB datasheet and google might be your best path forward.

Lefty

TECH GEEK

>LINK<  Scroll down a bit to see what info is available (edit: lumens is in link)
As always... Thanks for posting!!!

Chagrin


>LINK<  Scroll down a bit to see what info is available (edit: lumens is in link)


3000 lumens from just the 20ma red emitter alone? That's not possible -- those values are in microcandela.

robtillaart


Check the old forum: - http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1207331496 -
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

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