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So the Cree LEDs I am considering are shown in the tables at 85c, and with a water cooled heat sink scheme I expect temps would more likely run around 20-30c. It's cheaper than heavy passive sinks and active/fan cooled, and using a submersible pump, just about silent. I'd like to put a fail safe...

Just trying to wrap my turnip brain around interpreting spec sheets So take xpe2 warm white 2600-3200k, run at 700ma: bin Q4 not rated for cri shows highest flux at 171 lm higher CRI drops flux output. 90cri bin p4 shows 138 lm about 24% higher lm output from the Q4 As CRI number...

Eh, I'll just go with worm goodies, molasses and kelp and call it good.

Around wk 2 1/2-3 of flower now (I don't keep close track). Plants are totally healthy, just flower growth is slowing quite a lot. Growing in roots/supersoil w/xtreme mycos. Using blumats, could if needed excavate small holes at drippers to add amendments, or use teas. Not interested in...

Thanks GS, I appreciate the in depth consideration. Yet another wrench in my machinery, but very worthwhile info to chew on.

OK, so here are conceptual design schemes I am seriously considering at this point. I haven't had time to start plug in all emitter combinations into spectrum modeling graphs yet, but will start playing around with that soon: Certainly convinced that modules of some sort will be the way to go...

I think that was discussed on Supra's thread

So GS, simply put you think WW blue range is inadequate for flower due to wide angle? (purple curve) This is one of the main questions I have for flowering dedicated fixture.

Read your thread: Compelling argument for running on less current/better efficiency. Wondering how lazy I am. :eyesmoke:

No worries, thanks for the resource!

Thanks, part way there... is a scan of something on paper in a magazine or something. Wondering what the original source is and whether it is considered accurate today.

Hey what's the source and date for this one?

Great resource! Thanks

Thanks, so how did you come up with this graph? Is there a modeling program of some kind to do this?

So without resources for most growers to gradually change spectrum over this time period, how about reducing hours/day while still under veg lighting prior to switching to flowering lighting? like: 18/6 veg lighting 16/8 for 5-6 days 14/10 a few days change to redder spectrum couple more days...

OK, so back to FLOWERING spectrum, seems that part of the discussion just dropped out. Still have a couple questions Based on averaging SDS and eraserhead's recommendations, I came up with: 400-499nm: 12% 500-550nm: 15% 550-600nm: 13% 600-650nm: 29% 650-700nm: 30% 700-750nm: 3% The simplest...

Yeah. I have a spreadsheet calculator from another forum, that calculates dissipation in watts from number of fins and all dimensional info, but don't see how C/W/3": approximately .90 applies to that. Seems like a different set of parameters and equations.

I can do the math, but I don't understand what is notated here... C/W/3": approximately .90 Anyone?

OK, but I'm afraid I don't know how to interpret that. Please help me out.

Quite a romantic (and pretty realistic) outlook. Now is good for me! To overcome the stated drawbacks of my HPS now is a good thing. Starting with good heat sink seems the base for ongoing upgrades as emitter technology evolves. But who knows what the next technology will be?