Search results

Nah, plants still use IR during the day. Shade avoidance, root formation and so forth. It's near impossible to say what the bare minimum is that the plant needs in order to perform how we want it to perform (the secret spectrum ratio hasn't been unlocked!!!!). We're wasting energy left and...

I'm in a 2'x2' enclosure, I've got ~190W of LED, and I cannot imagine having 400W in there. That's an insane amount of light for that amount of space, at least in my mind. As you probably already know this would definitely play into why your temps are undesirably high. I agree with both these...

How many plants are you looking to grow, and in what kind of space?

Not sure what you're having issues with, Fran. Have you seen the "walk through" in my thread? I'd be glad to help if you're at all interested in finishing the project. I've got my first one running (waiting to be attached to incoming heat sink) and the process seemed pretty straight forward to me.

Miracle Grow has a bit of a stigma 'round these parts. I've seen grows using it turn out marvelous. I'm using Roots Organic soil. You can most likely buy it at your local hydroponic store. I recently found a website called Kelp4Less and they have a really nice selection of water soluble powders...

Not sure on the air flow. Do you have the Carbon in place? PC fans pushing air past Carbon sounds questionable to me. Other than that I'd say it looks good. Easy 4" Carbon scrubber: http://forum.grasscity.com/do-yourself/281136-how-cheap-easy-efficient-diy-carbon-scrubber.html Can of Pineapple...

Careful with those PC fans if you plan to place them at the start/end of duct work, I read that most PC fans don't create enough pressure to push air well through a duct more than a foot, or two. Lookin' good, Pico.

I can't give you a comprehensive link, or even all that much, but you've piqued my interest to find out what exactly the differences are, too. What's interesting to note is that the Cree XM-L2 is 5mmx5mm, so... technically, that's a 5050, too...

Hey, man, no worries, I've been gone for a month! Glad you stopped by. Sorry to hear about the heat, I'm dealing with a similar issue myself, so I know what that must have been like. D: Interesting how they use 'standard' chips in these T8's. I wonder why they don't state the size of the chip...

No worries, you're not the first person to mistake it for an LED of some sort. And if you build speakers I too believe we could get very, very off topic. >.< I'd like to take a class in CAD and look into the cost/difficulty of building a planar magnetic headphone. I'd be very interested to see...

Yes, but the main cola will be your best cola, I'm not sure why you would want to, it's really late to top your plant at that point. What you can do, though, is wait for the top cola to ripen and once it's ready to be chopped, harvest just that cola. Odds are lower buds won't be quite as far...

Are those remote phosphor? What do they mean by "COB" in this instance?

Not sure I understand the question. Cut the main stem? As in, the main stem of the entire plant? If just the stem to the leaf, yes, you can just cut the stem. If you're careful you can probably just bend the leaf slowly down and the leaf's stem will break at the node. You have to be careful that...

Looks like he's got the main stems wire tied to bamboo sticks. You can cut the leaves off, but most of the leaves are still doing work, imo. I say it more depends on what stage the leaf is in in its life as damage doesn't look too severe. Leaves start out requiring energy from the plant to...

Hey, Pico. My avatar isn't an LED module, it's actually an electret (electrostatic) transducer made by Sony in the early-mid seventies. Different colors of light have different effects on (or, rather, mean different things to) plants. It's about getting the results we want for the least amount...

You mean having a fan on your plants? If so, yes, plants love a light breeze. It forces them to grow deeper roots and thicker stems in order to withstand the breeze. Plants typically grow less vertically the more air movement there is so it's a good strategy to keep stretch down, especially if...

I agree with you. If you look on youtube there's a teardown of this bulb and the guy taking the video actually comments on how the metal core PCB in his wasn't formed correctly so there were large, visible air gaps between the PCB and the... ?decagon-allly? shaped heat sink. Mine, however, was...

Nope, I don't know what the globe absorbs, but diffusers tend to reduce lumens by quite a bit. Imo it's worth it. I'd wager ~10% efficiency increase by removing the glass, but who knows. If you look at Cree's XT-E HVW documentation the 12V model (what's used in the 9.5W Cree bulb) has an ideal...

http://www.bridgelux.com/products/decorarray.html I guess they're designed for other purposes so they separated the phosphor mixtures to keep specs in line with their intended demographics? Not really sure, but usually higher CRI equates to better spectral analysis for horticultural use, imo...

Tj-max for Cree XT-E is 150ºC (~300ºF). I don't see 200ºF for 20 minutes damaging the LED's (unless afterwards you take it apart like me! ><). You could also just whack the glass dome with a hammer and pull all the glass out. I saw a teardown video following this method.