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Rj-c is defined in the datasheet. I'd hope it is accurate. I've done some tests on vero29 with theromcouples on test point on LED and Heatsink to test thermal paste, Rc-h was not a problem. It's been awhile but I remember thinking "what was I worried about". Not very Green? nothing about...

The efficiency drop tracks closer to an increase in temperature than a increase in current. With air cooling, the degree of cooling is limited by the size and shape of the heatsink and the airflow over it. Water cooling gives you the opportunity to have a lot more cooling. How big would an air...

Maybe, but if it cost to much. you'll never get started

To those looking at the price. Water cooling can be many times more efficient. You drive them a lot harder. If your on a budget that means fewer LEDs.

You can break it up if you want. Tap: https://drillsandcutters.com/1-1-4-11-1-2-npt-carbon-steel-pipe-tap/?gclid=Cj0KCQjwkd3VBRDzARIsAAdGzMDBax5Yi4pCJHxN0LL_JJUF9P9fez4IOJAL01j-07Z2yOen0DbjFdYaAlc_EALw_wcB Wrench: https://drillsandcutters.com/3-4-1-5-8-adjustable-tap-wrench/ Or the like will...

hi, I looked at cpu blocks before all this. I couldn't figure out how to mount them without a two part epoxy thermal paste. I wanted to be able to change the LED alone. Also the last thing I'd want in a grow room is 300 little heatsinks and hoses everywhere. The reason for the size is. When I...

To make good use of a 2' light bar it would need to be mounted high above the plants. From the experiments I have done. I needed the same distance from the plants as the width of the lighted area. If I want to light a 5 x 5. The lights need the light to be 5 feet above the plants to get fairly...

your right it is very efficient. I could only cut these to length and thread the ends for a fee. We have a manufacture close to us. It's the packaging and shipping that are going to be pricey.

These were designed for a warehouse type room where the lights are mounted and unmoved at ceiling height . With 1 inch at each end for the threads and 2.125 inch per LED (vero29) 1 + 2.125 * 10 + 1 = 23.25 inches rounded up to 24 inches. $2 * 24 = $48. $48 to cool 10 LEDs isn't bad from where...

I started making a light and got distracted with other things. I put a 1 1/4 NPT thread on one end. That is a 1 1/2 inch hole in the middle to give a sense of scale. There is about 5/8 inch between the hole and the LED mounting surface. The LED mounting surface is 2 3/4 inches wide and the...

Hi, I have a couple hundred feet of aluminium extrusions designed for LED COB cooling. The hole in the middle is sized for a 1 1/4 inch NPT thread (standard pipe thread found at any hardware store). I'd need about $2 per inch to cover cost. Is it worth it to sell this stuff?

I have 4 of those all ready. I was thinking the V2 was something new.

Is this the V2 your talking about? http://www.digikey.com/product-search/en?mpart=BXRC-35E10K0-L-23&vendor=976

There is no doubt the Vero 29s are better. The fact I need 5 times as many power supplies kinda kills the cheap LEDs. Unless, I found a much cheaper way to drive them. I agreed the color difference is going to make some difference. I only have 3000Ks on hand and I had to pull that out of a...

I got my bench power supply and did some crude testing of the cheap ebay leds 3500K and a Vero 29 3000K. Not the same color but close. The cheap 100 watt LED driven at 27.9 V @ 700 mA puts out 445 Lux per watt and the Vero 29 driven at 39.8 V @ 2100 mA puts out 507 Lux per watt. Those are the...

I've always grown with 1000 watters. I know a couple growers using 600 watters. They generally had lower density and higher grams per watt. One of those growers switched to 1000 watters and got better density but lower gram per watt with everything else the same. I'm nervous about switching and...

You make a very compelling case for the LEDs. If one can get a 63% reduction in heat need roughly half the installed watts, that would be awesome. I'll have to build something and see it with my own two eyes. I don't doubt they work gram/watt. But can I get the same density and quality as 1000...

Trust me. I will. There is going to be enough output capacitance to kill for sure.

It's the cost upfront that kills it. He spent 2400 bucks to cover a 32 ft2 space.

I should be able to get in the 94% range with the right parts.