Recent content by upsetter.

Lights are 4 feet up, dimmed to 20 percent. I've stressed plants with these lights, but not at that distance and intensity.

Hey guys, I just cant figure this one out. I've got symptoms on all plants under cob led in raised beds. The plants are growing, but the tips and margins are burnt only on the new growth. The last run in this room went fine and the soil hasn't been amended. Soil is kept nice and moist and grow...

Just got 56 of these Samsung 4 foot F Series strips... thread to follow!

Here's a better shot of the arrays as I was cleaning up and reconfiguring the room.

I'll look into replacing with the B&W holders for this last fixture. I've been running these BJBs for 2 years now without any melting issues or anything else. I'm at just over 50w per chip on 133mm sinks. I've also been boldly exceeding the voltage ratings by running four chips in series, but I...

I had to look back to check what I bought. These smaller rigs are gen 5s, in the big room I've got 80 gen 6s and 16 gen 5s sprinkled in. All 3500k. I havent noticed any issues with the chips, but I havent checked closely either. I'm definitely going to build put some cxm22s at some point. Like...

Here are a few leftover COBs from the original build finally getting put together for veg two years later. The finished one was in use for a while on a single 4 foot frame, but was in a corner of the garage hence the grime on it. I reconfigured it for a small veg space on an 18x22 frame. I'll...

Here is a detail of one of the driver panels mounted remotely outside the room.

If I had to do it again, I'd roll with cxm22s. I was still learning at the time.

The whole setup was certainly not cheap. I could have set up the room with 8 HPS lights for less than 1/3 of the cost. I've got a total of 5200w in there and feel it is at least equivalent to 8000w of HPS.

A few years ago I decided that I wanted to grow more efficiently with a lower impact. I found this forum and read a lot and decided to switch over to COBs. I built an 8x20 no till bed and built a pretty large COB array sourced from cobkits. My setup is: 96 x CLU058 1825 chips powered by 24 x...

Brokedick weed growers pinching pennies.

Before I switched to LED, i was ready to buy a bunch of those boss reflectors. They look great.

Well yeah... That is the only drawback I am aware of. How much efficiency is lost? I don't know, but that seems to be a good enough reason not to do it. It's improved efficiency is the main reason to use it.

While SE bulbs are under vacuum, DE bulbs are full of nitrogen gas. The nitrogen atmosphere allows the bulb to operate at a higher temperature, which increases its efficiency. The downside of a gas-filled bulb is that the gas conducts heat from the outside of the bulb to the arc tube. Any air...