Question about Sunlight Supply 400 Watt Hps Sunsystem I Sun Gro Plant Grow Light

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Hello...need help.. replaced 600mh bulb then

Hello...need help.. replaced 600mh bulb then switch on.bulb came on for 4-5 seconds then unit stoped working.. fuse is ok ...and had look inside ballast box and all wires are noise at all coming from unit....jhon..

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  • Mark Willison
    Mark Willison May 11, 2010

    600W MH or HPS?

    Do you have any sort of meter to test if you have power coming out of the ballast? If not, it is a must have item in my opinion. Can get analog one from Home Depot for $13.99. See link below...

    Anyway, if there is indeed power coming out of the ballast, then you probably just have a bad light bulb.

    How old is the light bulb?


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Have you tried the switch yet? The plastic switches inside some ballast boxes don't do well with the heat produced by the ballast. You can try to simply bypass the switch and hard wire the ballast to the plug to test whether or not that might be your issue. If you need a new switch, just call Sunlight Supply directly they should be able to send you a replacement switch.

Posted on Mar 01, 2009

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ven if you`ve got the lights second hand it is worth giving the manufacturer a call for there explanation. If you think about it they don`t want their bulbs breaking in that manner.

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