2 Lights 1 Ballast

Discussion in 'Growroom Setup' started by phoenixkd2000, Dec 18, 2006.

  1. phoenixkd2000

    phoenixkd2000 Registered

    I've run across the info I'm looking for before, but I don't know where I found it.
    If someone could point me in the right direction that would be great...
    How do I run 2 lights off 1 ballast?

  2. justaseed

    justaseed Registered+

    is that even possible?
  3. MisterE

    MisterE Registered+

    At the same time? No idea..
  4. xcrispi

    xcrispi Registered+

    i've seen a contraption like this on O.G before ,
    was able to power up to like 4-1000w. lights from the same ballast box w/ a built in timer that governs all 4 . don't remember who manufactured it tho . kinda looked like an old school battery charger on wheels . sorry nomore help than this .
  5. phoenixkd2000

    phoenixkd2000 Registered

    I've run across actual plans somewhere on the net. I've given it an honest effort, but I still can't find and don't rememeber where I found it...
    I'll check O.G. and see and of course i'll post a link or a DIY as soon as I find it.
    Thanx all :),
  6. smokinbomb

    smokinbomb Registered+

    thats interesting i never thought of that but if it would work that would be bad ass let us know what you find out

    good luck-Bomb
  7. kindprincess

    kindprincess Registered+

  8. kindprincess

    kindprincess Registered+

    however, this doesn't work at the same time... it's called a relay; when lights turn off in one room, they turn on in another.

  9. kindprincess

    kindprincess Registered+

    where'd you guys go?
  10. smokinbomb

    smokinbomb Registered+

    i'm over here
  11. justaseed

    justaseed Registered+

    ok i see, 1 ballast cannot run 2 lights simultaneously, it's just done with a relay and timer. that makes much more sense. i was thinking that it was just 2 transformers,caps, and igniters in 1 housing. either way it's not a bad idea.
  12. kindprincess

    kindprincess Registered+

    i'm going to be setting up this way in a week or two...
  13. TestPilot

    TestPilot Registered+

    Not to start trouble, but couldn't you drive 2 bulbs of half the rated wattage of the ballast?

    Anyway, as mentioned, you're referring to a relay or interfacing relay. If you just want to control multiple ballasts from the same timer you use a relay. There's a good tutorial on hydroponics.net for building your own 240V/30A relay to control up to 4 x 1000W from one timer.

    On a side note: As a safety precaution I think it's best to control your hood cooling and ballasts from the same timer and preferably the same circuit just in case you're cooling timer failed or you tripped the breaker. It seems most fans run on 120V so you can't just plug them into the same circuit as your 240V lights.

    One solution I've seen is a standalone load center that takes a 30-50A double pole (240V) line. It's divided from there into 240V/20A (4 x 1000W) and a 10A/120V (cooling and timer) circuits. It's still two separate circuits on two breakers it's not perfect. Add a high temp override in between your timer and trigger cable and it would solve this.

    Otherwise you can just use a multitap on your timer output to run 2 x 120V trigger cables and drive a 120V relay as well as a 240V/30A relay. Add a high temp override in between the timer and multitap and your set.

    There is the link for wiring 2 rooms to one ballast, but they don't run simultaneously. It's just a switch to select which bulb the ballast is lighting. Too much trouble IMO.
    Last edited: Mar 30, 2007

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