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I didn't see that test, but I have an IR thermometer and even the slightest air movement is enough to knock 10C off a heatsink hitting 60-70C in still air. Real air movement will cause 2-3x that temperature drop. It's significant, and can be the difference between 70C and 40C at the heatsink.

What BS? Those numbers are right in line with basically everybody ever for those wattages. From @SupraSPL to @CobKits , @alesh ... pick your guy. Right around 1.8 PPF/W for relatively hard driven cobs with driver losses taken into account, CXB3590s coming in right where you'd expect as well. I...

I think we've seen enough garage testing of efficiency curves with Apogee meters, cross-referenced with data sheets and professional testing at this point to be fairly certain that halving the wattage and moving to 80CRI will give you more than a 6-7% gain in efficiency. It's just how the curve...

Real growers want stable genetics from legitimate breeders, not having to search through a ten pack of seeds for that one plant might match the vague description. Real breeders are growing homozygous plants. This is becoming even more important with autoflowers gaining popularity which are...

Since you seem to have all the answers: Where do plants come from?

So the V2 fixtures were high CRI, running at twice the watts, and 6-7% less photon output? That's pretty impressive on the Vero side. At 50W and 80CRI they would be crushing the Cree on photon output.

Well, fuck this place in the asshole anyway. It's toxic, and most of the smart people have long been driven away by bro growers with large egos and small brains. This whole forum feels like it's stuck 5 years ago with it's features and policies. I honestly don't know how @CobKits continually...

Sure Bob, except I am on much, much bigger forums than this one who I'm sure make much more money. They have banners, contributing users who also buy advertising, but the only posts that advertise are limited to vendor sub-forums, DIY group buys are encouraged, and every other fucking post isn't...

It's not just one part, it would make creating whole fixtures much cheaper...the heatsinks, the drivers, the cobs. @tomate's unfortunate outburst aside, it's not about what anybody has or hasn't contributed, and more about the fact that the only way to buy this shit is for somebody to become a...

Listen I'm all for group buys, we could really save some money without having to deal with endless sales pitches from people like @CobKits (sorry, but you are just replacing what would be group buys on any other forum), but I think the way this shitty forum is setup group buys are against the...

That's just not true (at all). Heatsinks work through radiation (which anodizing affects), convection and conduction. Last time I looked at this, in the sizes, temperature deltas, and airflow even passive LED heatsinks see inside of a grow room, the impact of radiation is minimized, probably...

I cannot stress how much easier a quantum board build would be...I'd be writing them and asking when stock is coming in.

I can recommend seedsman, for sure. Lots of freebies, fast shipping, good stealth, and everything I've planted has popped. Great customer service too.

I do wonder what decades of breeding under HPS have done, but I think there has to be limits to how far breeding can take us from millions of years under that giant fiery thing in the sky. When LEDs show nutrient deficiencies I sometimes wonder if HPS nutrient requirements are less because they...

Truly not trying to be argumentative, but they are not minor. Just to be clear, the 50% difference I was referring to was the ratio of R:B, as you jump between CRI and manufacturers. Keeping nominal color temps the same, that you can easily hit a difference that big. Pulling numbers out of my...

I think the proper way to do this is like @stardustsailor was doing here, with the traditional science literature-y breakdown of B/G/R at 400-499nm, 500-599nm, and 600-700nm. https://www.rollitup.org/t/cxa-3000k-80-vs-93-cri-an-estimation.833171/ 3000K, 4000K, 80, 90 it's all meaningless until...

That's all that matters.

A quantum board build takes maybe half an hour if you've never done it, and isn't that horrible purple color. Oof. Can't compare on price, know nothing about Meizhi.

Compared to any HPS, even a 3000K LED has more blue output. Separate veg spectrum is silly, and this forum is all the proof you need.

Two would fit fine, a couple 135W kits and bobs yer uncle, but you seemed concerned about heat and stealth. No light source is running anywhere near ambient temps. If you really need as little heat as possible and absolute stealth, autos are worth keeping an open mind about. Instead of 240W...