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I'm a dirty liar, it's now the 500$ walipini. The 5" Galvanized ducting was about 185$ As much as I love digging with a shovel, the freezing weather is coming and my brother stopped by with his backhoe. He saved me a ton of work and dug me a 45 ft trench for my greenhouse air intake. The idea...

I'm debating going with a sod roof but I've never done it before and the ground is freezing.

Intro: I've started my winter greenhouse project and have my first update picture. I'm digging a pit greenhouse with three big black water barrels and lots of stones for thermal mass and a small stove to heat the water for super cold nights. I live in Ontario in the Ottawa Valley, so it gets to...

OK! I'm sold. One change I want to make to the typical setup is to have four independently hung sections as opposed to one big unit. This way, I can grow different plants that grow at different rates. The challenge with that setup will be wiring it all to be on one power supply, yet allowing...

OK, I'm sold on the price aspect. I found this chart about heat sink mass vs wattage and the mass climbs exponentially. After 50W it's expensive. I guess that's why everyone's going with these 50W cobs instead of the 100w. One question I have about the Light Strips is the penetration and...

It's not 2%, we're talking 15-20% difference in par/lumen per watt. That works out to a significant difference in overall setup cost and energy consumption for the same amount of area covered. The difference being, if the price drops by 25% I can afford to buy shitty Chinese knock offs for a...

Everything I'm reading in terms of guides says they do need heat sinks.

I'm liking the lumens/W (180 to the cxm-32's 165) and the spread is obviously nice. What I don't understand is how they have flipped the script and SMD LEDs are somehow more efficient than COBs now? I thought that was the whole premise behind COBs being all the rage now. They are the same cost...

MIGRO claims the CXM-32 is 50% efficient, so I'm assuming roughly 50W of heat is produced. They also say that their light should run at 20 degrees celcius above ambient. So, I'm deducing that they have a 0.4C/W heatsink. The way heat sinks are rated is # of degrees celcius you will gain above...

I'm noticing a serious price disparity between new full spectrum cobs and some of the previous generations. In your opinion, is demand driving up the price or is it the cost of technical innovation being paid out? Or is it simply material cost? If it's material cost I don't see it dropping...

The appeal to the cxm-32 is that it runs cooler and more efficiently. The downside being even coverage. Migro uses passive heat sinks on their 100w. Also, if the fan were to somehow crap out the COB would probably burn. I've lived through too many of my pc fans dieing to trust them. My idea is...

I'm racking my brain trying to think where I'd find old heatsinks on 100w electronics. I'm looking for giant heatsinks to cool a 100w cob passively. So far I'm thinking old stereo amplifiers and air compressors. Any other ideas?

Has anyone used Alibaba to order things? Is it reliable? Their 130mm+ anodized pin fin heatsinks look amazingly cheap. How heavily will I get hit with duties and taxes at the Canadian border though? Most of the suppliers are from China or South Korea.

My current query is whether I would get enough even light distribution from a lens to get better use of the light in order to compensate for the loss compared to a reflector. The things I'm reading are inconclusive. There's a post on this forum that starts with "I did the measurements wrong" so...

I have read the few cxm posts on here indeed. Luminus cxm series seems like the clear leader, yet no one is in to them. Why? The MIGRO channel appears to scientifically put them ahead of almost every other light, but can you trust someone comparing their own product? In either case they are...

Hi, I'm a Canadian (Ontario) prescription holder and I'm trying to set up a system for a 4x4 grow area with 4 plants. I'm also keeping an open mind to future expansion as I will be applying for a nursery/research license. My intent is to make an efficient lighting system while remaining behind...