SupraSPL
Well-Known Member
Wow lots of brain power in here, great discussion I am just catching up on You are correct bicit I recommend 110cm²/dissipation W for passive cooling lamps of typical DIY efficiency (~38-40%) or 90-100cm² for lamps of very high efficiency ~48-50%. Those numbers were adapted from KNNAs recommendations and we have decreased the required surface area as LED efficiency has improved over the years. My goal has been to stabilize at Tj 50C. But in retrospect I came up with that goal before we got access to high efficiency whites, which behave much better with a high Tj than the reds do. And the Vero line has just stepped that up even further with amazing thermal performance at high levels of dissipation.
I have been impressed by the cooling performance of the CPU coolers. But if we are willing to accept a slightly higher Tj for the all-white COB lamps, how little power (if any) could we get away with to cool the lamps? Higher Tj should not affect the canopy temps or ventilation speed because ultimately the lamps are creating the same amount of heat as they were before, just moving it away from the COB more slowly. It has got me wondering, would passive cooling at slightly higher Tj be more efficient overall.
I have been impressed by the cooling performance of the CPU coolers. But if we are willing to accept a slightly higher Tj for the all-white COB lamps, how little power (if any) could we get away with to cool the lamps? Higher Tj should not affect the canopy temps or ventilation speed because ultimately the lamps are creating the same amount of heat as they were before, just moving it away from the COB more slowly. It has got me wondering, would passive cooling at slightly higher Tj be more efficient overall.