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This is a good idea which I have actually used a few times. There are a few things to consider. If you are using different pad layouts for different LEDs (say Osram and Rebels) you have to predetermine their positions and they are not easily changed after the first layout. Goud is correct...

Cree is US based R&D. The large majority of their manufacturing is now done in China (lower production cost and environmental standards). As far as white leds go, they are currently the best. In most color LEDs, the luxeon Rebels beat them. Bridgelux makes only blue and white LEDs now. They have...

Contrary to your thoughts, it is acceptable. Production cost is actually reduced via this method. Generally speaking (excluding prototype boards), nearly all PCBs are machine cut and drilled. Leaving the PCB in the machine for an additional 10-20 seconds to drill the diode mounting holes cost a...

That's actually dielectric silicon RTV... SDS is correct. It helps keep the connections together, air/water tight, and reduces risk of corrosion when in humid/wet conditions.

High power LEDs are supposed to be printed on a "Metal core" PCB which the LEDs are soldered directed to a sheet of metal which can easily be heatsinked. How they've done it is beyond my reasoning. My conclusion for this is ... whoever designed this has little knowledge of circuitry and...

Correct, and if you look at the XY scale, there is no possible way to reach above 10k Kelvin because you drop off the color corrected scale. That is the point where there is no other blending of phosphors and it is simple a blue LED. That is exactly how the tech guys from at Bridgelux explained...

Nothing against you or your research goud, but I'm not trusting a datasheet that has 1 wavelength characteristic for all whites from 2500-25000 and is 3 years old. The chart appears to be for a neutral white at that.

The quoted on above is the only one that is a datasheet. The other two are poor spec summaries. From the information I received from bridgelux, anything that would be considered 10k+ would be a 420nm blue with a partial coating of phosphor. They refused to make anything of that nature due to...

Do you mind showing a link to the datasheet for the 10k or 20k. I don't recall ever seeing an LED in that Kelvin range.

SDS, if you get those "pink" and "hot whites" made I might be interested in offsetting your cost with the purchase of a few of them. I have yet to find a company that is willing to make a run just for me. I would prefer 3 watt diodes, but using 1 watt leds might work in some cases. Send me the...

"Piggybacking" is a term used that means carry the load. He is referring to linking the mains power from the first panel to one or more behind it. In many newer model LED panels they are calling it "daisy chain". The following link is how e-shine does it...

If the heat sink is made out if 1050 as SDS mentioned, self tapping screws will cause it to crack and separate at any thickness over .030". With such a soft ally It's safe to bet that the base is at least .250". I personally suggest 6063 or 2024, however if you are using extrusion or fins of any...

Concerning your PCB attachment issues: Have you considered using a dielectric coating directly on the heat sink and mounting the leds directly? As for the riveting/screwing. The price difference is very little between the 2 options if you are hand assembling them. A good carbide tap cost around...

Are you saying that there are 3 types of cannabis: Indica/Sativa, Ruderalis, and Hemp? That is in direct contradiction to RNA sequencing and the genome research done. There has been many people wanting to take Ruderalis away and make it sativa only, but I have never heard of anyone calling Hemp...

There are a few things I would like to point out. First, your statement of: What ? Through BL harvesting, Deep RL is irradiated from Ch ? Interesting...Irradiated where exactly ? To nearby chlorophyll molecules ? Plants are glowing deep red light when exposed to BL ? ... Aha! That's why...

The infrared part of the electromagnetic spectrum covers the range from roughly 300 GHz (1 mm) to 400 THz (750 nm). It can be divided into three parts:[3] Far-infrared, from 300 GHz (1 mm) to 30 THz (10 μm). The lower part of this range may also be called microwaves. This radiation is...

Does post #576 suggest that you will be adding a large amount of 660nm red for your flowering stage? 660-680nm range was the only red mentioned in the posting. Does that also mean that you will be attempting to play with night time lengths via 730 Far reds? As for my previous post on the...

I forgot to add, the amount of CO2 uptake is directly effected by temperature. Cannabis tends to grow better in temperatures above 25 degrees C (77 F) and 35 C (95 F). According to one study (Temperature response of photosynthesis in different drug and fiber varieties of Cannabis sativa L.) "In...

The last article you posted proves that the blue and sun light has a HIGHER chl A to B ratio than using red light. They did not test 660nm light and just took prior research from 1987 (the newest) that 620-640nm red is best for growth. "Red light (600 to 640 nm) has the highest quantum yield...

What myself and guod are referring to (correct me if I am wrong) is a clean room type environment. A sealed pre-entry room that the air is removed from prior to entering the grow/clean room. The number of times per day that you open/access your grow area MAY be sufficient to exchange the air...