Gchart on here was nice enough to find a site that allows for different charts to be easily compared by the user. Thanks a lot for this, this should help a lot of people, including myself.
He then was able to input most of the LED tests I have done so that you can easily compare them.
Very cool and a great tool for those wanting to compare LED's.
Very interesting. It’s easy to see why FET-driven lights using quad Nichia 291C emitters get so hot! I’m surprised they don’t fry the LEDs with such a low forward voltage.
TA, it would be useful to see a power / output chart as well. Right now it’s practically impossible to compare XHP with 3V LEDs…
Would adding that be possible?
If you click the direct links to my tests in my Sig it lists the power and outputs for all the LED’s.
Got to compare it the old fashioned way but it works. If Gcart can make up a graph for comparing by wattage and/or efficiency that would be really cool as well.
Thanks to you both, nice to have graphs to be able to predict vf and lumen’s before you even build a light.
I have used the data a lot, very helpful. The comparable graphs make it even better.
The results from different users are not directly comparable in most cases.
None of us have professional spheres but standard calibrated spheres. Since all of our standards are different our readings also vary some.
That said for the most part we are reasonably close all things considered as long as you don’t overlay the graphs.
Plus even small things like the reflow of the LED can have large effects on the results when pushing things to the limit.
Doing separate charts for other testers would be cool but overlaying them could lead to more confusion and issues then it helps when they vary by 10-20% in some cases on paper but in the real world are the same LED.
I agree the specifics of testing are important but honestly I bet you could take one of your Nichia and Cree tests (219 & XPG3 or something) and the same LEDs from djozz and come up with a Texas to Amsterdam factor.
