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It's sort of absurd to expect to ventilate 10'x12'x10' (1200cu. ft.) and 6'x10'x10' (720 cu. ft) with 4"...anything. A full 14" (16" on center) stud space (54 sq. in. - roughly equivalent to one 8" or two 6" ducts) might work to take air out of the space but where does it go? Where is fresh air...

That's exactly what I was thinking of doing a few posts ago. I'd want to link the relays to temperature (at the canopy or at the exhaust). I'm thinking of using at least four temperature sensors (Reservoir - temp/pH/TDS; Roots or Intake - temp/RH; Canopy - temp/RH; Exhaust - temp/RH) and I'm...

You could do a darkroom-style light trap with staggered panels (or panels with holes in them). I've made a rough "top down" diagram to give you an idea of what I'm talking about. The major parts are labeled. The pine-colored parts are solid wood or plywood with routed notches to fit the panels...

No need for more than one fan; cool the lamp (not the room). Make sure the lamp cooling duct is well sealed (this is literally why duct tape was invented) and exhaust the heated air right out of the structure/home. If you've done the ductwork properly, the lamp run shouldn't pick up any...

If the case is large enough, T5 have a better lumen/watt efficacy than CFL. I'd certainly recommend those. But a larger CFL may do some good (unless you are having problems with heat). What have you done to increase the reflectivity of the inside of the case? You don't need Mylar or...

Right-o. I can't imagine it'll be any quieter. On the other hand, it might not be drastically louder. Good luck with it!

How do you figure 460W? I could see a small spike during "striking" (though most digital ballasts use a "soft start" routine which should be using less power at this point) but if a 400W ballast is rated as being >98% efficient, it should use a maximum of 400W*1.02 (or 408W) to run the bulb...

Wow. That's a huge axial fan. I found it advertised online. The site claims it pulls 665 CFM (free air) @ 5400 RPM (110VAC with detachable cable). Still impressive, surely, but they wanted $99 for one. I paid $35+S&H for a 6" axial that pulls 235 CFM @ 5400 RPM (110VAC). The cabinet I bought it...

Maybe that was true for cap/coil (magnetic) ballasts but "digital" ballasts are >98% efficient. In other words, a 1000W digital ballast uses 1020W of electricity - at most - to keep a 1000W bulb going. Digital ballasts are also proven to make bulbs last longer - up to three times as long -...

Thanks. I'll check out that link when I get back to my computer. I found some ridiculously cheap (

Sure, it's possible to automate to that point (and it can be fairly inexpensive if you DIY). You'll need to know frame/finish carpentry, household plumbing, 120VAC~240VAC wiring, and how to build/program a PLC. If you had this knowledge up-front, you probably wouldn't be asking the question...

I've been kicking around the idea of automation for a long while now. I like where this seems to be headed. My "dream" is to have a touchscreen interface on the outside of the cabinet, electronic locking with biometric "key", SMS or MMS (webcam) in case of break-in or other calamity...

To be honest, I didn't even bother watching the video. The House bills were so despotic, so nonchalant about rights-grabbing, that I can't expect the Senate to be any different. After the CoA ruling on patient-to-patient transfers (which are fully backed by the MMA; look up the word "transfer"...

I don't see how any "areas" are "gray". An "enclosed, locked facility" is just that; foundations/floor, four walls, and a roof (with a securely locked door). If you ask me, the "hoop house" made of welded fencing (above) is all of those things. Especially when you consider that it's well off the...

Sorry to post without bothering to read the whole thread (I did wade through four pages) but has anybody thought about the ways this proposed law violates the right to free association and assembly at the federal level? The whole reason that state medicinal use laws haven't been attacked by the...

I've been hearing the same thing. But then I also hear that four months delay (between the "fifteen days" and receipt of initial patient card) is the norm. Renewals, as far as I've seen, come in a matter of weeks (about two months). This is the first I've heard of five months delay. The MDCH...

Nice! Are you using the Arduino for environment monitoring and/or other automation?

That's not what the report said at all. What they did say is that "early" electronic/digital ballasts operated at such high frequencies that they created acoustic resonance within the arc (which literally shook the bulb apart and caused premature bulb failure). EYE/Hortilux has a vested...

OK; I should state first that I have not used them myself. And I haven't found any posts on here (except my own) that mention them. Are people not using them or are they just not writing about it if they are? They have to be the least expensive HPS bulbs on the market ($35/600W) and I find it...

I haven't seen the insides of one but I'd guess that they, like most "dimming" devices, drop a (larger) resistor into the circuit. I'm not exactly sure of the mechanics of HID lighting but that should dim the output at the lamp. The ballast would still be using more or less the same amount of...