there are a lot of switchable ballasts but the one i'm talking about has both an MH and HPS ballast. It is designed to use both lights (a 600w HPS and a 400w MH) at the same time or individually.

here is a link to the product (mine is the 1000w Sun System 7 - but there are others):
MH/HPS Dual Spectrum Grow Lights

email468: Yeah, mh and hps simultaneously would be awesome. I envy you Unfortunately I can't afford this yet (ballast, reflector, ventilation, electricity, you know). But maybe one day, maybe one day...

storzbickel: Yupp, got the mh/hps ballast already plus the bulbs. Got it from Headshop , Growshop , Bongs , Shisha , Waterpipes and Smoking Accessiors, for the record. And I'm glad to see you are willing to try this aswell! Just don't blame me when we both fail miserably

MH and HPS at the same time with one ballast? Sounds interesting, I had no idea there was such a product!

not at all. i had alot more females in my leading crop now than i expected. so it wont be too much trouble if any of the blueberry group fails. i dont think we will have horrible turnout.

and email. so from my understanding both lights are pumping at the same time, which is where the "full spectrum" comes from?
because that blows the product i linked out of the water.

and can you run each bulb independently? i guess that could be a stupid question , because why would you want to if you can run both at the same time...

I saved and saved after getting very tired of dealing with crappy lights. i haven't regretted the dual-spectrum light but seeing the results using LEDs from VictorVicious has me second-guessing spending so much. But i'm happy with my results so i guess it really doesn't matter.

Ah, oh. I thought you were running one MH and one HPS simultaneously. My english is a bit rusty

Here are some pictures - the ballast has a 600w HPS and a 400w MH capability and the reflector can hold both bulbs at the same time. You can run them at the same time (dual-spectrum) or independently. not the same as switchable which you have to run one or the other but not both simultaneously.

Attached Images

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very nice.

how is that thing on heat? are you able to control it pretty well?

i have a very powerful exhaust fan for the cabinet and the lights are air-cooled with a different exhaust fan. Otherwise, I think the temps would get way too hot. It helps that i live in a cool climate.

hmm.

i have a small exhaust fan in the room, but one of the walls is an exterior wall, so had went so far as to triple insulate it so i could keep a good temp going.

im about to order one of those right now, but im going to have to see about a larger or additional fan. going to have to take some measurements....