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They do have machining services. They cut to your desired length for free, but I don't know about drilling and tapping cost. The Samsung strips don't have mounting holes anyway, they have semicircles notches cut in the edges for mounting. I just glue them down with JB Weld epoxy.

The pin sinks are extremely effective at passive cooling - the 7.984 profile.... not so much.

Doesn't really matter what they want - the tide is moving, more and more states are voting for legalization every year, its only a matter of time before the Feds cave to voter's demands.

About 4 square ft. 6 square feet will need about 200 watts, using the B-lux Gen 2 strips.

That chart just shows the reduction in light output in relation to temperature normalized at 25C. There is a lot more math involved in calculating heat generated. But I would work from an estimate of 40/60 light/heat at 80 watts. Cobkits could probably give you a closer estimate. The 8 x 7.984...

A COB running at 80% efficiency? - not on your life. Realistic efficiencies are more in the range of 35-55%. At 80W I'd hazard to guess those cobs are running in the 40-45% efficiency range. By 8" x 8" - do you mean you need 64 square inches of surface area?

0.7 inch actually. They fit nicely on the Heatsink USA .601 profile that costs about ~$1 per foot.

Once I get a little extra cash saved up I will be doing that myself.

Thats the key right there - running dozens and dozens of plants allows you to get statistical mean values and effectively normalize the inherent variations - then you can actually see if UV is making a difference or not. You have to be able to look at averages of very large groups, and side by...

H-influx uses the same diodes as the Q series, but has much higher diode count.

May I ask what the purpose of the plumb bobs are?

No, not really. Its no better than anecdotal evidence which is scientifically useless. The reason "side by sides" are not valid and useful in any meaningful way is that there is normal variation among plants anyway, even clones in virtually identical conditions will exhibit some variability in...

no, I mean a couple of these: https://www.amazon.com/AmazonBasics-Equivalent-Daylight-Non-Dimmable-6-Pack/dp/B01MSMKBG3/ref=sr_1_3_acs_sk_pb_1_sl_1?ie=UTF8&qid=1534015470&sr=8-3-acs&keywords=LED+light+bulb Plain old light bulbs like you would use in your living room table lamp. They work quite...

https://www.arrow.com/en/products/si-b8u261560ww/samsung-electronics

A lot depends on how many plants you are starting. If you are starting a lot of seedlings at once, then T5 makes sense. OTOH, if you're just starting a few seeds, like three or less, you can just use one or two 14W LED light bulbs for the first 2 weeks.

For 4x4, you'll want a bit more than 300W - I'd suggest two of the 300WX8 lights, running at 400-500 watts total.

Crap, I forgot all about that.

Look for "blue blocker" sunglasses.

Strips brother, Samsung F-series strips or H-influx strips.

THIS.