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Thread: how far from my plant should 600watt hps lamp be??

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    Default how far from my plant should 600watt hps lamp be??

    ive just got my new 600 watt hps lamp and reflector. its a DUAL spectrum lamp so its good for veg and flower.

    im not sure how far from the plans it should be as i never had one before, can anyone help ????


    all posts welcomed and thanks for helping

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    Hi weedfarmer, is it a sunmaster by any chance? Anyway i use 600w and if you keep 18" away thats about right, they can go a little closer upto 15-16" but play it safe and 18" as done me well so far. If you have a piece of string with a glass thermometer hanging from the reflector and measure the string from lowest point of light to top of thermomenter as 18" you get a good idea of canopy temps and a marker for when you need to raise the lamp
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    hi YOKO thanks for posting.

    yes it is a sunmater, i was expecting a bulb just for flowering but this was an unexpected bonus. do i just grow under this light for the entire time(veg thru flower) and do i need to change height of the light for different stages?

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    Yes mate use for entire grow my cheese have loved this so far and just try keep 18" away but dont worry if a few " either way. Iv just changed reflector that enables me to keep my light 12" above so hoping for some great results. I cant understand why people change bulbs when you can get one that does both and there not to expensive, iv done my current grows using these bulbs and both are looking fab

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    sounds good mate, cheers :-)

    im gonna get it set up tomorrow. is it ok to go 12/12 from seed with these as i dont have my growroom blacked out completely yet? (will be done soon)

    ive got danky doodle seeds going just now, you know anything about them?

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    that mate i cant answer for definate as im yet to grow from seed though cant see no reason why not, maybe keep light further away while seed maybe 22", you can go as far as 2ft away with these no problem, when my plants were young cuttings i kept m light at 22" and over the next few weeks gradually moved it a few inches closer

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    Quote Originally Posted by yoko2009 View Post
    Yes mate use for entire grow my cheese have loved this so far and just try keep 18" away but dont worry if a few " either way. Iv just changed reflector that enables me to keep my light 12" above so hoping for some great results. I cant understand why people change bulbs when you can get one that does both and there not to expensive, iv done my current grows using these bulbs and both are looking fab
    Hey YOKO how's it goin fella, I use duel specs too for precisely the same reason! why buy 2 when 1 will do...& I've also recently changed to a 600watt with a supernova shade & didn't know what I should put it at, so post matey,thanks
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    Quote Originally Posted by Captain Scarlet View Post
    Hey YOKO how's it goin fella, I use duel specs too for precisely the same reason! why buy 2 when 1 will do...& I've also recently changed to a 600watt with a supernova shade & didn't know what I should put it at, so post matey,thanks
    No worries CS, just had a look at your reflector and it states the design makes it throw quite a bit of heat down so i would start at least 22"-24" away and get a thermometer at canopy level and then move a few " closer over the next few days, if you have an intake of cool air you can also put that so it jets across the bottom of your bulb, this will give you an extra " or 2

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    Hey mate I use heat shields on my lights as this allows you to get 2-3 inches closer even closer if you have a desk fan blowing on your bulb have mine at 10-12 inches n they love it

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    got my light installed now, its about 20" from the plants and about 25-28c.

    just want to know if i can use a lesser wattage bulb eg. 250/400watt in my ballast for 600 watt? i know i cant go over 600 just not sure whether under is ok.

    thanks for helping people


    peace out

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