Greengenes707
Well-Known Member
Sweet, about time. B-lux has been talking about this for a while now.
As for the reason you don't see accurate numbers on certain vendors sites, is because they refuse test their lights. They only regurgitate incorrectly extrapolated data from data sheets and forums. Sometimes it lines up...most of the time not. Even little variations in the estimation of LER and QER, make the error margin larger rather than more accurate.
What makes it worse is one company, has had bare chips(cxb3590 3500k CD) on sink tested and knows very well the losses associated with the system of reflectors and drivers...but still post the incorrect extrapolations, not the actual sphere data.
As for working temps...85c Tj happens all the time in DIY and kit land a lot, despite what many may think about their builds. 70-85 Tj is happening a lot. Ask everyone to whip out a thermocouple, you'll be surprised. And if we are talking about vendors especially, which is what the comments are about when actual numbers are referenced...all vendors are pushing chips fairly hard, not sure what @CobKits is talking about.
But even at 50% output...vero29's output curve only puts them at 56% of 100%...aka ~2.2 at 45W with next to nothing in gains past there. As well as bridgelux's disclaimer that low currents are not stable with the vero 29 line. There is nothing helping or showing over 2.5µmols/w on the chip level is possible...let alone from an entire system running at 75+w per chip at real Tj's.
It is 2018...there really is zero reason a light company selling horticulture lights should be posting data sheet and forum extrapolations. It's a simple $500 test to show the correct and actual output of a fixture.
As for the reason you don't see accurate numbers on certain vendors sites, is because they refuse test their lights. They only regurgitate incorrectly extrapolated data from data sheets and forums. Sometimes it lines up...most of the time not. Even little variations in the estimation of LER and QER, make the error margin larger rather than more accurate.
What makes it worse is one company, has had bare chips(cxb3590 3500k CD) on sink tested and knows very well the losses associated with the system of reflectors and drivers...but still post the incorrect extrapolations, not the actual sphere data.
As for working temps...85c Tj happens all the time in DIY and kit land a lot, despite what many may think about their builds. 70-85 Tj is happening a lot. Ask everyone to whip out a thermocouple, you'll be surprised. And if we are talking about vendors especially, which is what the comments are about when actual numbers are referenced...all vendors are pushing chips fairly hard, not sure what @CobKits is talking about.
But even at 50% output...vero29's output curve only puts them at 56% of 100%...aka ~2.2 at 45W with next to nothing in gains past there. As well as bridgelux's disclaimer that low currents are not stable with the vero 29 line. There is nothing helping or showing over 2.5µmols/w on the chip level is possible...let alone from an entire system running at 75+w per chip at real Tj's.
It is 2018...there really is zero reason a light company selling horticulture lights should be posting data sheet and forum extrapolations. It's a simple $500 test to show the correct and actual output of a fixture.