Amdphenomx4 Posted February 6, 2013 Share Posted February 6, 2013 Can you make a spectrum graph of the SemiLED as it appears you have a wonderful bit of hardware to do as such or post the datasheet of the one you used. Perhaps the peak isn't much of a peak. Link to comment
bhazard Posted February 6, 2013 Share Posted February 6, 2013 Will more 405nm 120s be in stock soon? Tried to order some but they couldn't be added yesterday. They are going to be mixed into my chinese lights first along with the 420 and 430nm violets, and then as part of my DIY fixture which is nearing completion. Should be a good test to see if they enhance color/performance over just 420nm. Link to comment
Milad LEDGroupBuy.com Posted February 6, 2013 Author Share Posted February 6, 2013 Thank you very much for the video. Very clear and easy to understand. Competitors can now only charge you is that there is no documentation on the diodes... By the way, you do not plan to release the datasheet for diodes or at least chips? We are going to release a batch of spectrums/voltages soon. Just need to take the time to do the tests one by one. We post actual results instead of data sheet average results. Can you make a spectrum graph of the SemiLED as it appears you have a wonderful bit of hardware to do as such or post the datasheet of the one you used. Perhaps the peak isn't much of a peak. yup, will be working on that soon. We are going to do all the chips in one go in a couple weeks. Will more 405nm 120s be in stock soon? Tried to order some but they couldn't be added yesterday. They are going to be mixed into my chinese lights first along with the 420 and 430nm violets, and then as part of my DIY fixture which is nearing completion. Should be a good test to see if they enhance color/performance over just 420nm. No more old style 405nm. We are moving over to the XTE footprint on all the LEDs. 1 Link to comment
Milad LEDGroupBuy.com Posted February 17, 2013 Author Share Posted February 17, 2013 Some more readings from a Apogee PAR meter same boards, no optics, 2in from sensor 405nm LEDGroupBuy Exotic = 331 420nm SemiLED = 254 430nm LEDGroupBuy Exotic = 440 Link to comment
bendel Posted February 17, 2013 Share Posted February 17, 2013 Some more readings from a Apogee PAR meter same boards, no optics, 2in from sensor 405nm LEDGroupBuy Exotic = 331 420nm SemiLED = 254 430nm LEDGroupBuy Exotic = 440 Somehow the 405nm and 430nm readings do not fit what I would expect from the spec. the 405nm has around 30% less output (640-680mW vs 880-960mW radiant power @ 700mA from your website). The Apogee PAR meter then should have around 15% less sensitivity at 405 than at 430nm. Link to comment
MeepNand Posted February 17, 2013 Share Posted February 17, 2013 Very nice video. So the Led Group Buy 430nm are about 30% better? Not bad at all. Link to comment
rO.oster Posted February 17, 2013 Share Posted February 17, 2013 I saw the solderless 430nm TV are on the XT-E boards. Any plans to bring any more TV to the standard Cree style stars? is there a real gain to the XT-E stars, such as glass optics? Link to comment
jedimasterben Posted February 17, 2013 Share Posted February 17, 2013 Somehow the 405nm and 430nm readings do not fit what I would expect from the spec. the 405nm has around 30% less output (640-680mW vs 880-960mW radiant power @ 700mA from your website). The Apogee PAR meter then should have around 15% less sensitivity at 405 than at 430nm. I actually just asked Milad about that, the numbers are raw from the Apogee unit, not adjusted for the sensitivity of the sensor, so they should be even higher. I saw the solderless 430nm TV are on the XT-E boards. Any plans to bring any more TV to the standard Cree style stars? is there a real gain to the XT-E stars, such as glass optics? More optic choices and better thermal transfer, so they can handle being run at their full current in almost all situations. Link to comment
Milad LEDGroupBuy.com Posted February 17, 2013 Author Share Posted February 17, 2013 Somehow the 405nm and 430nm readings do not fit what I would expect from the spec. the 405nm has around 30% less output (640-680mW vs 880-960mW radiant power @ 700mA from your website). The Apogee PAR meter then should have around 15% less sensitivity at 405 than at 430nm. Those are raw numbers so I didnt do any adjustments to handle the PAR meter sensitivity. I saw the solderless 430nm TV are on the XT-E boards. Any plans to bring any more TV to the standard Cree style stars? is there a real gain to the XT-E stars, such as glass optics? we are working on it. Link to comment
bendel Posted February 6, 2014 Share Posted February 6, 2014 So, finally I got the LEDs ready for test. Had the LEDs for quite some time, but only not had a chance to put the on some test boards. Test description: 6 LEDs on a board with constant current circuit with powered with 24V. The overall current is set to 500mA, what give the LEDs roughly 600mA. The intensity is measured in a defined distance with a Apogee MQ-200. What is quite bad, since the sensitivity is going down below 450nm and quite low at 400nm an below. So you would have to adjust the values if you compared different wavelengths. (The 376@422nm should be the same as 205@398nm). Also if the LEDs have different lenses and angular distributions, that would give different results. But I think that is not the case here. The Semileds where tested quite some time ago, but I tried to keep everything the same. I measured the output after start and 3min later. Main difference is that first it has room temperature and later the LED has a much higher temperature (the board is around 70-80°C, but difficult to measure). The values are: peak PAR value@0s PAR value @3min LEDGroupBuy 405nm 407nm 274 211 LEDGroupBuy 430nm 427nm 429 400 Semileds C35L-U-A 410-420nm >=360mW@350mA 422nm 376 372 Semileds C35L-U-A 390-400nm >=280mW@350mA 403nm 182 102 Semileds N35L 400nm >=360mW@350mA 398nm 205 167 A normalized spectrum for the LEDs: http://i62.tinypic.com/2qdvrtc.jpg Result: The Semileds C35L with 400nm degrades quite badly with higher temperatures. The newer (introduced last year) N35L is much better and behaves like a typical LED. The C35L 420nm is the only LED I have ever seen that has a constant output for different temperatures. Comparing LEDGroupBuys 405nm and the N35L, they probably are quite similar if adjusted for the PAR wavelength error. Same for the 420-430 ones at higher (normal) working temperatures. And then keep in mind, if you go towards 450nm, then the Cree XTEARY would blow them both away (>600mW@350mA compared to around 400). Now I can rest. Steffen Link to comment
Milad LEDGroupBuy.com Posted February 7, 2014 Author Share Posted February 7, 2014 So, finally I got the LEDs ready for test. Had the LEDs for quite some time, but only not had a chance to put the on some test boards. Test description: 6 LEDs on a board with constant current circuit with powered with 24V. The overall current is set to 500mA, what give the LEDs roughly 600mA. The intensity is measured in a defined distance with a Apogee MQ-200. What is quite bad, since the sensitivity is going down below 450nm and quite low at 400nm an below. So you would have to adjust the values if you compared different wavelengths. (The 376@422nm should be the same as 205@398nm). Also if the LEDs have different lenses and angular distributions, that would give different results. But I think that is not the case here. The Semileds where tested quite some time ago, but I tried to keep everything the same. I measured the output after start and 3min later. Main difference is that first it has room temperature and later the LED has a much higher temperature (the board is around 70-80°C, but difficult to measure). The values are: peak PAR value@0s PAR value @3min LEDGroupBuy 405nm 407nm 274 211 LEDGroupBuy 430nm 427nm 429 400 Semileds C35L-U-A 410-420nm >=360mW@350mA 422nm 376 372 Semileds C35L-U-A 390-400nm >=280mW@350mA 403nm 182 102 Semileds N35L 400nm >=360mW@350mA 398nm 205 167 A normalized spectrum for the LEDs: http://i62.tinypic.com/2qdvrtc.jpg Result: The Semileds C35L with 400nm degrades quite badly with higher temperatures. The newer (introduced last year) N35L is much better and behaves like a typical LED. The C35L 420nm is the only LED I have ever seen that has a constant output for different temperatures. Comparing LEDGroupBuys 405nm and the N35L, they probably are quite similar if adjusted for the PAR wavelength error. Same for the 420-430 ones at higher (normal) working temperatures. And then keep in mind, if you go towards 450nm, then the Cree XTEARY would blow them both away (>600mW@350mA compared to around 400). Now I can rest. Steffen Nice! Glad someone else also did tests to show the difference Link to comment
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