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So now I have an interesting question. Someone want's to buy the two 3500k LED's that I am currently using for the solo cup. I was wondering if the community would be alright with me replacing the two 3500k emitters with a pair of 4000k emitters. Everything else would remain identical, just a...

I never quite understood why induction lighting was so expensive....

Have you looked at the speed of light lately? For our purposes with the distances light has to travel in the grow room, this is practically instantaneous. Energy doesn't lazily drift from state to state..... OK so that last part isn't quite true in all situations.... but for this example it is...

Most of the energy released as light ends up as heat eventually due to scattering(photons transfer energy every time they bounce) and inefficiencies in metabolic processes. A 1kw power source is going to produce the same temperature in a sealed room regardless of if it's HID, LED...

The upper left one is going to be my girl. I'll get a marker on her. The runt is going to get pollinated and the big'un will be cloned. Spreadsheets on the marro that is all.

Even that isn't really true. 1kw of power is 4000 btu, no matter what its from. The same amount of energy has to be extracted from the system in order to maintain a temperature equalibrium within the system.

A bit more involved with building a 80 watt led light compared to screwing in a light bulb...

Link, heatsinks for DIY LED lamps.

I think I accidentally quoted you :P sorry bout that mate. I mostly posted that for anyone who may end up reading this page.

It should be noted that you have to take into account the rating of your circuit breaker as well. If you have a B type circuit (not to be confused with a B-type DRIVER) then you can only switch, at most, two drivers on and off at the same time. Also as you start to approach max capacity for your...

Meanwell HLG-240H-C---[] pdf link Voltage drop calculator'] Voltage drop calculator I'm personally looking forward to serving under our new high voltage overlords....

Why not indeed? Give it a try and report your findings! I'd run them super soft though, for heat reasons.

Despite my neglect the last 2 weeks, two of my girls have already shown sex. I'm secretly hoping for at least one male to play but I won't complain too loudly if they're all girls. I plan on transplanting and vegging the losers.

Sounds like I definitely need to get a big pack for the vegetable garden this year. Couldn't keep the tomatoes from wilting all summer. Thanks @Scotch089 and @Old-School Doesn't take much, I just forget :P. I'll have plenty of time to log the next comp after I win this one.

sorry for the delay in the spreadsheet. I went ahead and took those who have withdrawn or have not posted from the update log. I've updated the sex log but I don't know how accurate it is. Hard to tell when I miss something :P

@bellcore they are blumat jr's. I'll be replacing them with some full size blumats when they get here. They work well. These things wouldn't be alive had I not used them... I kinda forgot about the comp for a few days.

My scale took a crap on me so I'm using GH Flora bloom, micro, with Si shield for the time being. Added a shelving system and a drip pan, the whole assembly is rock solid now. The spreadsheets will be posted tomorrow morning.

Why this one vs that one? Depends on what you want. The area 51 units are modular they give you the option of spreading out the light for keeping mums alive. Or you can bring them in tight to up the intensity for flower. Is that useful? Only you can decide. If you don't need that flexibility...

Cree cobs are not made in the u.s. Kingbrite is a good company to order components from. Cree cobs work better than anything else out right now. The quality far surpasses cheap cobs.

Hell for the price of 9 W90's you could build a small greenhouse and plant some monsters in 55 gallon trash cans using 0 watts. The sun is hard to beat if you live in a cooler climate.