Can anyone tell me how I could test the difference between a 1 watt Luxeon LED and a 3 watt Luxeon led ? In as much as they both look the same, neither has any markings saying 1 or 3 so I'm assuming I know which one is which but would like to know for sure before attaching them to their drivers.. Would there be a difference in resistance or anything else one could measure with a MM ?
Thanks, Steve.
In message , "!!::!!::" writes
Current limited supply, stare directly at it for 30 seconds timed with a stop watch and time how long it takes for you to get your sight back? Seriously though, there is a guide n Luxeon 'binning' codes floating around that may give you more information as to how they classify and mark their product.
In message , Clint Sharp writes
Ooops... Funny but not at all relevant, sorry...
Not funny, either What are you smoking these days, Clint ?
Measure the current at full brightness, the power in watts will be about the current times the voltage across the LED.
"glenbadd"
** Begs the question - fool.Only the maker's know for sure what brightness can be sustained for the rated life span.
That why we have things called specs.
..... Phil
... Nice one. You noticed I deliberately didn't say how full brightness was determined. Short of having a light meter, maybe measuring the die temperature and trading that off against a life span derating could give a better idea. I'm just throwing some ideas, not trying to be definitive.
"glenbadd" "Phil Allison"
** Full brightness = maximum brightness.The point is that this is not the same as NOR indicative of the maker's speced brightness or the maker's speced input power level.
** No - you were *begging the question* !!!A tiresome mistake in reasoning beloved by all fools.
...... Phil
Phil's point, that you seem to have missed, is that you can't and shouldn't try to *determine* full brightness. Instead, you should read the manufacturer's spec, since they conduct proper testing and quality control to find a figure for which they can guarantee a specified lifetime.
After all, if you could pump enough energy in, I'm sure you could make it brighter than a supernova... for a short time.
Which leaves you guessing, since you don't know which part you have, so you don't know what spec to read. If you know which of a small number of possible parts you have, read the specs of all, find some specified difference in behaviour that you think you can measure, and do that.
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