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My bigger light is a 46W version of this with 24 lights. You calculate the wattage of each light by multiplying the forward voltage (about 2.4V on these Osrams) by the current of your selected power supply (700mA, or .7A). You have to look at the spec sheets to get the forward voltage at a...

I have successfully run these Osrams at 700mA for hundreds and hundreds of hours. You do lose a bit of efficiency at this current but you get higher light output with less LEDs. If your heatsink is big enough and (more importantly) the thermal path is good, there should be no problem. This is...

No problem! I measured the heatsink at around 95 degrees. So, warm to the touch. Haha, actually I had the heatsink left over from an old computer project. I think it was only about $20 on closeout at a computer site. When old chipsets get replaced the heatsinks that fit them usually go on...

Have a micro cab? Thinking of building one? Frustrated with hot, bulky CFL lighting? Confused by inferior, expensive LED lamps? You've come to the right place. DIY LED lights are perfect for space-restricted micro cabs. They're small, customizable, efficient, and (best of all) COOL. No more...

If you don't have an exhaust fan, how will you deal with the odor?

The Federal Reserve is the top bank. It sets interest rates, loans money to other banks, and prints money when there is a shortfall (which is always). It bought and paid for Congress many years ago, its board is non-elected, and it is one of the most prominent and guarded buildings in Washington...

I'll default to your knowledge then. My formal education is in music so you'll be wasting time arguing with me unless you want to talk about Wagner :D I've built a couple grow lights with excellent results but they're nothing fancy--just LEDs wired in series. I'm more concerned with the thermal...

Haha, well relatively cheap. I use the LPC-35-700 and it's $16. The dimmables are more. Obviously you'd need a bunch of them for a big light. But I think it's worth it for the stability and protection. This isn't a very cheap hobby unfortunately. Maybe I'm missing something. So you have your...

I would not recommend driving LEDs with PC power supplies. I looked into it before building mine and it was just too much of a hassle. You only have a few rails of 12V which would only drive 3-4 lights each. Also you have to install a voltage regulator as LEDs are current controlled devices. Too...

When we're talking about LEDs, we are directing a very small amount of energy (relative to HID lights) at specific wavelengths. So we want to be as efficient as possible. A 25% drop in light output of each LED in an array of dozens of them will affect yield, no doubt. I think that's a Cree...

Absolutely it's not, it wasn't meant to be a direct comparison. I just wanted to show how LEDs (especially reds) drop off a cliff with light output once they reach ~40C or so. A heatsink will reduce temps for sure. Problem is if the fans or enclosure isn't great at getting rid of heat, or the...

Rasser, I think it would be difficult to fill in the gap in the FR-4 holes there with something electrically isolating. Thermal adhesive might work, but you'd have to goop it in there; not really the best way. And if you use Kapton tape, you also suffer thermal transfer penalty. The challenge...

Corso, I've seen very decent results with Hydrogrow lamps. Just a quick run through their site claims a 95F operating temperature (enough to not kill the AllinGaIP reds) and use Bridgelux LEDs which are better than the no-name Chinese kind. Their 600w unit also goes for a cool $2000 so keep that...

This study is obviously biased toward HydroGrow. Yes, they are a good company who make some of the better lamps. But they cannot claim to speak for the entire market. Having built a couple DIY LED lights myself and having personally seen results not only from my grow, but from all over the...

I vote overwatering. Especially the last one. Let that soil dry out.

Plants look real happy & healthy there, curious! sorry to hear about your brother, but the ladies look great!

Nice thread, I love DIY LEDs lamps! I built one with 660nm reds, warm whites and royal blues, all Osram @ 700mA. Except I didn't use the stars to mount, I used thermal pads. Can't wait to see pictures, hope the ladies are doing ok!

It's bagseed and judging by bud structure and leaves, it could have sativa in it, some of them go 13+ weeks. I'd say give it at least a week or two, let those buds fill in more.

Not even close. Try a month.

Great thread, should be a sticky!