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Nice genuine solution. :) Does that kind of circuit need some kind of protection, in case of a string failure? How do you keep the string currents equal? I think there was some kind of a problem with parallel circuits in a commercial panel, some leds being dim and others overdriven by unequal...

Oh, nice find guod! So 2 sets of 10 in parallel, or am I missing something?

Utterly confusing, XML-U2? U2 is a bin, and sure as hell warm whites don't exist as U2 flux bin. I highly doubt that they are XML2's either. Sometimes I wonder if the Cree's you can buy from china are made by Cree at all, I'm getting more and more suspicious about those cheap deceiving little...

Gotta agree with PSU, try sourcing selected top bin osrams in small amounts, not much luck eh? Yes, you'll find deep reds from led-tech, but I haven't had much luck with anything else. So for a small panel, those IS engines start to look a lot better if you really want THE best.

Trichome production is really interesting, though puzzling subject. Thinking of their function, my thoughts are that they are somewhat a response to a threat (pests, herbivores, radiation etc) and have a strong genetic component to their expression too. "Ripening" of the trichomes is unfamiliar...

You sound a little disappointed to some aspects of this grow? Is it mainly because of plant morphology, not ripening fast enough, bud structure etc? May I ask what are your goals in the long run with leds, are you looking for better performance than HID in quantity or are your goals more quality...

How did I miss this, congratz for the harvest! Do they list the bins used in those cree multichips from ebay?

Holy crap, those buds look awesome!

I think performance/price ratio of DIY will beat the household bulbs and tubes, though it takes a lot of work to source parts and compare components. Of course a lot of labour too, no good to have a pile of components in your drawer, those won't grow any plants as opposed to a plug and play...

Very interesting driver talk guys! That overcurrent pulsed driving sounds extremely interesting, have you stardustsailor done any experiments if the leds last abuse like that and how long? I don't know if the current itself actually causes lowering efficacy, I think it is the temperature rise...

I like the narrow lens angle, but the price is not competitive enough. PPF / $ or € is much lower than using top/high bin leds like XT-E CW R5, X-BD red P2, XP-E2 red P3, oslon ssl red T3 etc. driven at 700mA. But overall, nice package and might be easier to build a nice looking fixture...

Again, I am not qualified to make any assumptions or suggestions on the subject, but still I can't keep my mouth shut. :smile: http://www.life.illinois.edu/govindjee/Electronic%20Publications/1963/1963_Gov.pdf Page 9, I think is saying that Emerson enhancement effect diminishes at stronger...

Big thanks JMD! Those cheap chinese drivers would save me quite a bit, so I'll trust your opinion about them for the first version at least. Another good point is that its easier to find single drivers with higher voltages than from meanwell for example. Could you explain effects of ripple in...

I have fried couple of motherboards and some other computer components when a cheap psu has failed. That, my very incomplete electronics knowledge and a general distrust towards cheap chinese electronics kind of drives my fear. :) I was hoping that you have an idea how the circuits are built and...

Thanks! How much did you pay for delivery? Those are quite heavy, so I expect high delivery charges at least when buying several pieces. Please do test those drivers! I would like to know if it's possible for these drivers to fail in a way, that would destroy the leds? I would hate to burn...

Thats an awesome price for heatsinks! Care to share sources?

Oh yes, 120mm fan should produce a little less noise if chosen right. The gap between the plastic(?) casing and pcb must be quite small, so I don't know if a bigger fan is better for cooling though. Someone should try it, if it can be done easily? :) I was very tempted to buy one earlier, but I...

Now that I read more carefully, Hans stated that he expects over 15% improvement over the earlier model in light output. I think that could be counted just for better thermal performance of XB-D chips vs. older XP-E. For oslons, if they were 3T bin overall improvement would be larger. So my...

Hans updated his site, he uses Cree XB-D for new leds, too bad he does not reveal the bins used. Overall I think this XB-D is Crees "budget" lineup of emitters, little lower output of whites for example. Reds should have similar output as XP-E2, little cheaper price, but at least yet you can't...

Less photons, but ones with more energy. :) ..but yes, blue leds tend to be more efficient, in terms of radiometric output. For example cree XT-E 550mw royal blue @ 1 watt is over 50% efficient, but puts out less photons than red XP-E2 P3 @ 1 watt that is under 50% efficient.