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Looks good bud! I've built a couple 600 watt fixtures myself. I laid mine out a little differently but expect a similar footprint. How's life? How have you been?

These are an interesting design for this application. I wonder what the best way to mount these is and if having them mounted flat against something like sheet metal would hamper their effectiveness. On the flip side, mounting them in some sort of enclosure with a single fan or negative...

I'll try to look that up when I get home. I would just avoid plate....that would be overkill and expensive.

Here is a pic I found of the one pictured previously before I fucked up. I made a stencil using a piece of paper and marked the holes for the screws based on the centers I marked where the lines cross. Since then, I always drill a small pilot hole exactly in the center before marking the other...

I think most of the heatsink design questions are answered earlier in the thread. No, I did not need to modify them, just allow enough room for them to fit. A 3 inch Milwaukee cup drill is what I used to cut the holes. Yes, that's aluminum sheet that a local shop sales. It's raw AL on one side...

Also, 16 is too many if only because even 12 is pretty heavy once you have it all put together. They would fit though, no problem. With smaller heatsinks and running only 35%-40% power, there may be some advantage in terms of efficiency and coverage with 16. It may still be worth trying. I have...

The bottom right is what happens when you don't correct for clearance. The funny thing is I realised it before I cut the hole, re-marked it, and still cut the hole in the wrong place!

Thanks for the good vibez. All is good, I just got really busy with life. I'll post some pics of recent success etc. The LED lights are killer.....much much brighter than I expected. I've had to adjust several things to make them work like I want. Mostly it's just that these lights are so so...

So tired. I've had a lot on my plate just recently. I will try to get to this over the weekend and get these lights built. I am going to use the old housing from some 4 bulb x 4 ft T5 fixtures (ballasts are not good and they are missing connectors for the bulbs) to make a couple veg lights first...

Here is what CREE has to say on the subject. Of course, you could claim they're bias and maybe their testing needs to be done a little differently.

You're probably right. You're opinion is maybe the most valuable one here too, because you're one of the only people I have seen do really well with HPS first. It certainly would be less expensive to run 12 per hood if it will do the job adequately. Perhaps I'm too caught up in the wattage and...

So, I agree about the dead pockets of air. I've had a few thoughts on this but I think it may not matter simply because of the heat sinks being used. These pin style shouldn't really require air movement, so the fact that there is a constant supply of air holding a constant ambient temperature...

I was just looking for that information. I'm pretty sure this is a very thin anodize job, so I'm wondring how much it will impact thermal conductivity. I was trying to find something good about that subject. I am hesitant to sand or polish these because they are just so so flat. It really is...

Lol, I wasn't aware this was going on in another thread too. Those are some pretty big commercial grows using LEDS. I don't really think LEDs/COBs are cost prohibitive if you look at them over 5-6 years. I did the math elsewhere in another thread, but if you compare them to HPS over a 5 year...

I did some more research because I wasn't real sure about the color vs radiated heat in these heat sinks as mentioned by @Toaster79 . As stated in the previous article it has more to do with the coating than the color. Raw aluminum is super inefficient at radiating heat. Anodized aluminum is...

Here is a sketch of what the dimensions will look like with 16 COBS. I had to adjust them in from the edges a little to accommodate the pins in the vaulted hood. The big circles are the outer diameter of the heat sink. The little ones will be the holes where the holder and COB are mounted to the...

I'll get together a list of all the stuff I'm using. I can't remember the name of the paste off the top of my head. I've read reviews and test that show it is roughly as good as artic silver and I can buy it in a much larger tube. The tape works really well too. I saw a paper on this recently...

@sixstring Genius! This works really well too.

I did some COMSOL simulations on this a couple weeks ago. I'll have to go back and see if I can find those files at work. I may not have saved them, but I can do it again if I have time. The difference is probably pretty big. Convection is related to surface area, so just in terms of the "disc"...