Aluminum is easy to tap. The trick is keeping the tap square to to material being tapped. WD-40 is excellent lube for tapping aluminum. Never use a sulfinated oil on aluminum, it produces a toxic gas and causes the threads to corrode away. Since the load is very small, you can use a slightly larger tap drill if you're having trouble. A "roll tap" is much stronger, but requires a different size tap drill. "tap" and "die" are not interchangeable.you need to be very careful when tapping, aluminum is quite difficult to tap . i used a paste wax for lubrication and that seemed to work pretty well. Only snapped two dies
As far as quality for monochromatics, I believe that it is actually the opposite, the CRI gives a great quantitative reading but again [where I was wrong] as long as it is one of the 8 averaged colors, if the spectrum [nm] falls outside of one of those 8 colors, it could be funky....^^^Bingo, though I wouldn't say "Fool's Gold" as much as "Slippery Slope". Probably important for induction, it can be good and bad for white LEDs IMO, (see PICO's COB grow and CREE's less than optimal for growing High CRI bulb for good and bad high CRI examples respectfully). It's pretty good for monos but more for a quality or performance indicator, (from what I've read), since their CRIs are much lower, but higher than average can indicate a wider spectrum, (if you want that), and/or good Tj junction performance, (See Lenks' "Designing LED..." for more on that stuff).
It's just a matter of time till they come out with the new ways of quantifying LEDs, like R96a, which we'll then argue about . Bottom line it's a Photometric rating, right?, and that has limited value in our world I think. Best use it as just another indicator of a LED's potential performance, and not as a "Seal of Approval" IMHO. Peace.
That's a serious amount of COBs. What are the specs for the leds?Got parts, lots more coming.....View attachment 3039285
Kerosene works well on aluminum too.Aluminum is easy to tap. The trick is keeping the tap square to to material being tapped. WD-40 is excellent lube for tapping aluminum. Never use a sulfinated oil on aluminum, it produces a toxic gas and causes the threads to corrode away. Since the load is very small, you can use a slightly larger tap drill if you're having trouble. A "roll tap" is much stronger, but requires a different size tap drill. "tap" and "die" are not interchangeable.
NASA should be contacting you LOL, your setup will be running at 43.7% efficient or 142lm/W.Got parts, lots more coming.....View attachment 3039285
So they hit 276 lm/W at 4100K and 303lm/W @ 5150K, I hope that is what we have to look forward to They said it was at 350mA but we don't know the Vf. Maybe a large COB running soft.Looks like cree set a new record
http://www.cree.com/News-and-Events/Cree-News/Press-Releases/2014/March/300LPW-LED-barrier
I just ordered from them last week shipping was 5 bucks and change. Use the USPS option when checking out.Yes they are available. The price just went up to $2 each unfortunately and shipping from Newark is $15 minimum if I recall. It also requires a drill and tap of the heatsink surface.