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  1. Doer

    CXA3590 Build Plan

    Go figure. :)
  2. Doer

    Police beatings are not Racial

    And they may have to shoot that horse
  3. Doer

    Police beatings are not Racial

    You are. You are living Life with press blinders to tell you what to think. You think you are immune from a beating, white guy? Nope
  4. Doer

    Police beatings are not Racial

    I've had one. This guy got one. We have seen Asians beaten in SF. So, this is a problem. It has nothing to do with race. Cops are on edge. Don't fuck with them. The same goes for rattlesnakes. They never say "sorry."
  5. Doer

    New Cree 730nm xp-e emitter!!

    I had to adapt, brother. We all have to adapt. :)
  6. Doer

    DIY light mover, idea thread. With a twist.

    I have only one thing to say. Garage door opener. :)
  7. Doer

    LED questions (and some more)

    Steps are about art. :) How close a color match are a pair of LEDs? They throw them into bins, based on this and other considerations. And they are not built into the chip or anything that I thought. They are calculated for human vision. At the Step 2 ring, of the David MacAdam ellipse...
  8. Doer

    pls help w. figuring out heatsink (fins) size for a LED aluminum slab heatsink

    Now that you see this, CFM is not what we need. I has to be in Linear Feet per Minute. I did a bunch of calculation on this in my build thread early on. (a few weeks ago. :) ) https://www.rollitup.org/t/cxa3590-build-plan.863105/ You need another factor of how fast the air goes past your...
  9. Doer

    pls help w. figuring out heatsink (fins) size for a LED aluminum slab heatsink

    In general, rules of thumb, i.e., (more formally named as,) heuristics, are used. And SpuraSPL has refined these for us and I extrapolated water from that. 75cm^2 - completely passive, no fan. 25cm^2 - active fans, constantly on 5cm^2 - flowing water So, you use a measurement called the...
  10. Doer

    COB efficiency Spreadsheets

    The hard head who listens.....eventually. :)
  11. Doer

    CXA3590 Build Plan

    @bicit our lucky day! This from Newark14, Voucher code THANKS61 can be used through April 30th 2015 * Feel free to share with whomever you would like.
  12. Doer

    COB efficiency Spreadsheets

    There it is, in black and white, what I took a while to grasp. I was all for 1.4a driving current, but I saw my light. Between .7 and 1.4a, you pay an extra $1.77/wPar to run low current, But you gain slightly over 7% in efficiency. !!!! And you get ~12% more flux density. You apply that...
  13. Doer

    COB efficiency Spreadsheets

    Pin this thread.
  14. Doer

    New Cree 730nm xp-e emitter!!

    Do you even realize that making accusations and whining about how unfriendly we are, and bitching about "the other day" makes you no friend, and not at all friendly. It makes you come off very unfriendly. Just want to stir the pot? Are you new to forum life, in general. This is not...
  15. Doer

    New Cree 730nm xp-e emitter!!

    I don't really see how that rare joke, could drive you deeper into confusion. This is not a class, we are not teachers. This is a group of stoned people discussing a topic. And always there is a little fun to be had, when we are stoned.. We are sharing and we will even spoon feed if you ask...
  16. Doer

    New Cree 730nm xp-e emitter!!

    I swear, by gawd, that is true. But, I drink 4 beers and they turn back into girls.
  17. Doer

    COB efficiency Spreadsheets

    Very nice ya'll. Does anyone know the story of the invention of the first spreadsheet, Lotus? It was a couple of guys that were trying to represent data to each other and came up with the row/col/2 layer (data and instruction) approach. They used it to solve their own engineering, what ifs...
  18. Doer

    New Cree 730nm xp-e emitter!!

    Well, are you are party to the solution or a party with a problem?
  19. Doer

    New Cree 730nm xp-e emitter!!

    But, lighten up is still good advice, right? That's what these guys keep telling me.
  20. Doer

    New Cree 730nm xp-e emitter!!

    You did see that as a joke, right? If you stick around long enough you will see it contains vast humor.
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