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So, I found a list of L.E.D.'s from Cree here (the company seems to be known for efficiency, they power most of the bicycle lights that I know of) is selling a line of lights designed for growing plants. If you click on the data sheets, you'll find something like this:

enter image description here

Now, I know that plants reflect green preferentially because it is the least useful color to them (energetically speaking) so I assume that this matters.

I know the first few things about electronics, so I would really like to use one of these in something that I build. However,the question becomes:

What kind of spectrum light and I looking for? What is the difference between the "vertical farming" lights and the greenhouse lights? (Viewing angle?

I kind of want to put some plants in a box coated internally with aluminum foil (it can reflect more than 90% of the energy), and hook one of these bad boys up for some inside growing. Thanks alot.

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    $\begingroup$ A simple Google search using the title of your question will give you many resources. The Biology.SE community has agreed that questions that show little or no prior research effort are off-topic on this site unless you have shown your attempt at an answer. Please edit your question and tell us where you've looked for answers, what you do know about the topic, and where exactly you still have questions. Unresearched questions may be subject to down-voting and closure. $\endgroup$ – MattDMo Dec 17 '16 at 18:52
  • $\begingroup$ I'm voting to close this question as off-topic because it seems more suitable for Physics.SE $\endgroup$ – AliceD Dec 17 '16 at 21:31
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    $\begingroup$ The main question is also unclear. $\endgroup$ – WYSIWYG Dec 18 '16 at 5:41
  • $\begingroup$ I think the question is on-topic but unclear and lacking in effort (exactly what do you want to grow and at what scale? what do you know from before, and what information are you missing?). $\endgroup$ – fileunderwater Dec 20 '16 at 8:26

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