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Just turn down the exhaust if you're getting too cold but the plants should handle it up to ~60-70'F, just might stunt their growth a little. Might want to watch the humidity when you flower, it's a little high and might cause mold.

The 600 watt DE's fire at 200v which is higher than standard HPS bulbs but the 1kW DE bulbs, at least the Ushio ones seem to operate at 230v which is similar to regular HPSes. From the looks of it all that's required is a high frequency ballast.

Marketing, perhaps?

Shouldn't be enough light/heat for you to worry too much about at least regarding hot spots. Even if you're running the hood fan at half, your primary concern should be ventilation. It looks like quite a tiny area with no A/C or exhaust which could heat up the area and cook your plants...

Typically the increased yields from higher quality lamps will more than make up for the cheap bulbs - that and less light deterioration means less bulb changing in the first place.

I missed the earlier discussion on operating frequency and dimming - I'm including a spec sheet I received from a ballast OEM on alibaba for the curious. TL;DR - Freq increases as you dim. https://mega.co.nz/#!esZlmQhQ!I_rS3OmSQhm8Y88vOyvoK-L5VQRP1wn-3qAcunIOmfY

Really if you're running actively chilled water too much air might not be a good thing. All it does is heat up the water which winds up reducing dissolved oxygen capacity. Bubbles contrary to popular belief doesn't actually transfer that much oxygen to the water - it's the surface disturbance...

http://rollitup.org/t/ushio-de-ballast-compatibility.858244/#post-11267068 Here is the earlier thread I started requesting more information.

Yeah sorry, I've got one of those large pumps lying around but it was never worth it for me to use it. I just wound up sticking with tiny pumps, one or two for each bucket. The problem with large pumps is not only the sound it makes but also the extra heat it pumps into your water. Unless...

All the major DE bulb manufacturers recommend high frequency ballasts in order for the bulb to reach it's advertised life. There is a (minor) difference between the newer DE ballasts but the cost difference from manufacturers are minimal. I'm in the middle of getting some "samples" from...

Eh are you running DE bulbs on mag ballasts? Ushio support says to use high frequency ballasts only and nowhere else have I seen anyone recommend mag ballasts with DE bulbs.

Cowboy - Yeah that's what I meant. You can also find them on ebay under hydroponicsetc something, they're the cheapest AC/DE type reflector resellers I've found though you might get it even cheaper from alibaba if you buy bulk or if the shipping doesn't kill for a "sample". bluerock - I'm...

Gavita actually has a 600/750W bulb now with it's own fixture. Can't find a corresponding remote ballast for it though, outside of Gavita's own line which is rather pricey. As for the DE bulbs, yeah the reflector selection isn't really there but I like what I'm seeing with the Thunder Sundyn...

Horticulturesource.com has one of the biggest selections out of all of them. In the end though I always use Google shopping as my go-to for price checking since they have a great price-compare tool. There's also alibaba.com where you can find the Chinese manufacturers for ballasts/bulbs/tents...

I think the newer Gavita lines are actually made in China but I couldn't find a source for their remote ballasts. I know the first units were built in Holland but word is they've changed. Ultimately it's the electronics inside that counts and I haven't found anyone that's as efficient as they...

I'm going to paste a portion of an older post of mine. The only ballasts that actually stood out to me are the Gavita ones - they seem to be more efficient than the rest by 1-4 percent which adds up over time. That's 10-40 watts of efficiency which can mean hundreds of dollars of electricity...

Awesome. I've found a few sources for high frequency ballasts on alibaba.com for 130 shipped. Just pretend to be a bulk buyer and request a few "samples" and they'll ship it via DHL. ~$100 per sample and $30 per ballast DHL shipping. 130 is still much cheaper than a rebranded import marked up to...

Is root riot sponge-like or does it break apart easily? Those might be what I've been looking for a long time now.

That's a complete double ended fixture, yeah. You can get a remote ballast and bigger/air cooled reflector to keep the heat down though. You can get a DE compatible ballast on alibaba.com for ~130 shipped. A Thunder Sundyn runs ~165 and a bulb for ~110? Comes out even cheaper than the Gavita. I...

Now I do. I used to have this tray of brown foam-like root cubes that worked great but I forgot the name and never found it again. I tried another brown cube tray and it turned out to be dirt and broke apart easily. So now I just stick with rockwool since at least it won't fall apart. I never...