NewBie
*Retired*
Billson said:Newbie,
What current are you running your test setup at?
1000mA on that big monster heatsink above.
Billson said:Newbie,
What current are you running your test setup at?
Newbie said:Anyhow, the LED under test has now dropped from a reading of 310 on that chart to 270 now. The current is measured the same in both, to within 0.1% on the meter reading. The tint has visibly shifted very considerably, and is easily apparent- no need to compare against anything, you can look at it and tell it is purple white now (not cold white or even blue white, purple white)
BHP said:So, my question is; from your data, can you make any reasonable guess as to the relative total lumen output between the Cree and Seoul chips you tested?
I've got some paint that cost 250 dollars for a jar, that I'd like to use for a home-built integrating sphere, but I haven't found a decent 24" sphere to start it all off with. I have had it for a long time, the search continues.
chimo said:Seoul definitely has a different phosphor mix.
Here is a comparison with some Cree and Luxeons. The top photo is just taken in daylight. The bottom one was taken at the same time but has been illuminated by a 1W CreeUV light. I had to move the UV source a fair ways back so the Seoul phosphor would not saturate the image.
Paul
Calina said:Wow, it glows ! Does this means that GID buttons and O'rings are unnecessary with these lights?
BPH said:I'll try again (and then stop bothering you'll). I don't think I was able to make myself clear.
Can a reasonable conclusion be drawn from NewBie's testing as to if the Cree or Seoul has more Total lumen output? (that would be either yes or no)
I assume the answer is not really, too close to call. It could go either way depending on how NewBie's hybrid integrating sphere favors the particular radiation pattern of the emitter and other testing details.
-BPH
I wonder if tint change would happen so fast with less amperage... Say 750 mA...NewBie said:1000mA on that big monster heatsink above.