Re: Bridgelux thrive spd
Posted: Sun Mar 07, 2021 5:08 am
...thanks...
on first glance you might take away that view. There is one fundamental constant with leds that drives efficacy and is the control point for all led evolution and that is forward voltage, the 50 LPW leds of 15 years ago vs the current 200+ LPW is the reduction in forward voltage, whether it be via die improvements, led packaging or phosphors etc. The Bridgelux is running at over 0.2watt, while the others are around 0.18 to 0.19W. My counter to your view would be that if I raise the vf of the Lumileds to a number still under 0.2 watt I would get a lot more PPFD than the BLX part. If I design a strip using parts like this, my first consideration will be spectrum due to the nature of these parts, but forward voltage is going to be key in offering both rich spectrum and best case efficacy to meet customer expectations. The first question asked when it comes to Optisolis I get is, is it as eff as 301B and off course it isnt, but you give up some eff to get a richer, fuller spectrum. The next point would off course be how can we translate all that in to meaningful Percentage Wavelength Distribution (%B-G-R-F) with products to find the ONE.PeteR_1 wrote: ↑Sat Mar 06, 2021 3:46 pmThanks for sharing this info.Welight wrote: ↑Sat Mar 06, 2021 4:50 amSeems we have generated some really good flow of information on this. I can share my testing on some 98 cri chips.
This was a single diode mounted on a star PCB and enclosed in 4inch PVC tube with spectral sensor on top, so around 10 inches from light source. All leds tested identical method with bench supply set to 70ma.
Results
So couple of points. I distribute Bridgelux so have no axe to grind, Im guessing these parts are incorrect and we are returning them. That said while they have the highest output at 70ma they also have the highest forward voltage. One concern also is the Thrive is max drive of 80ma so we are nearly maxed at 70ma. The clear winner on efficacy is Lumileds at 2.71v which along with a great spectrum makes it a really nice part. Spectrally the optisolis is a fuller and more complete spectrum. For me the Cree and the Lumileds are close for out of the box performance at around 70% of the cost of Optisolis
cheers
My conclusion from the posted info is that the Bridgelux may be the most efficient, if it was run softer at lower amps (Watts) it might still provide more light than the other LEDs. Bridgelux is approx;
4% more Watts and 11% more PPFD than Cree,
7% more Watts and 11% more PPFD than Lumileds,
4% more Watts and 34% more PPFD than Nichia.
The SPD Chart alone is not enough info, the SPD charts are sometimes misleading, they only show the distribution relative to the highest Wavelength output. The Percentage Wavelength Distribution (%B-G-R-FR), if also available could then be used to compare the actual spectrum content pertinent to use as an horticultural light. The SPD Chart does show that Bridgelux has more 420nm wavelengths that the other LEDs.
IMO, Quantifying horticultural grow light percentage wavelength distribution is Pertinent info that was usually misunderstood, lacking or completely missing but is now at least available with DLC Listed Horticultural Light Fixtures and the info can be extrapolated to DIY Fixtures.
Thanks for the reply.Welight wrote: ↑Sun Mar 07, 2021 5:30 pmon first glance you might take away that view. There is one fundamental constant with leds that drives efficacy and is the control point for all led evolution and that is forward voltage, the 50 LPW leds of 15 years ago vs the current 200+ LPW is the reduction in forward voltage, whether it be via die improvements, led packaging or phosphors etc. The Bridgelux is running at over 0.2watt, while the others are around 0.18 to 0.19W. My counter to your view would be that if I raise the vf of the Lumileds to a number still under 0.2 watt I would get a lot more PPFD than the BLX part. If I design a strip using parts like this, my first consideration will be spectrum due to the nature of these parts, but forward voltage is going to be key in offering both rich spectrum and best case efficacy to meet customer expectations. The first question asked when it comes to Optisolis I get is, is it as eff as 301B and off course it isnt, but you give up some eff to get a richer, fuller spectrum. The next point would off course be how can we translate all that in to meaningful Percentage Wavelength Distribution (%B-G-R-F) with products to find the ONE.PeteR_1 wrote: ↑Sat Mar 06, 2021 3:46 pmThanks for sharing this info.
My conclusion from the posted info is that the Bridgelux may be the most efficient, if it was run softer at lower amps (Watts) it might still provide more light than the other LEDs. Bridgelux is approx;
4% more Watts and 11% more PPFD than Cree,
7% more Watts and 11% more PPFD than Lumileds,
4% more Watts and 34% more PPFD than Nichia.
The SPD Chart alone is not enough info, the SPD charts are sometimes misleading, they only show the distribution relative to the highest Wavelength output. The Percentage Wavelength Distribution (%B-G-R-FR), if also available could then be used to compare the actual spectrum content pertinent to use as an horticultural light. The SPD Chart does show that Bridgelux has more 420nm wavelengths that the other LEDs.
IMO, Quantifying horticultural grow light percentage wavelength distribution is Pertinent info that was usually misunderstood, lacking or completely missing but is now at least available with DLC Listed Horticultural Light Fixtures and the info can be extrapolated to DIY Fixtures.
Cheers