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Thread: 315 cmh vs 1000 watt hps

  1. #21

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    Since joining this forum a few months ago I have been back and forth between LED, CMH, 400v ballasts, double ended HPS and everything else out there. In the end I have decide to go for MH/dual spec HPS ( I have not skimped on the light output to allow for the dual spec HPS) and high end reflectors. I just think you get more bang for your buck and don't want to jump into something new as the whole light scene is changing so quickly whatever you buy now will be obsolete within 12 months.

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  3. #22

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    Quote Originally Posted by Viz View Post
    They are very pricey that is true. But it seems they do not need to be replaced as often as the HPS are changed according to the article. In fact the entire CDM set up is expensive compared to HPS. HPS you can pick up for £90 complete and the similar kit will set you back £229 for CDM
    HPS bulbs do not have to be replaced as often as people think....
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  5. #23

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    Loki, a 315 system does not replace a 600 hps so wouldn't be a fair side by side.

    400/500w is more likely.

    I've used one 315 for two grows now and a 400w hps has better penetration so you won't get anywhere near the depth as a 600 with one 315w light.

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  7. #24

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    I've been interested in cmh lights for some time. They run cooler as well as the better spectrum etc.

    Price is my issue. I'd also want two to replace my one 600w which would mean 2 hoods in my room or 1 double hood (neither feasable)

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  9. #25

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    For me if that test was true all it says to me is that you need 24 expensive lights to replace 8 hps, you'd never be running more efficient, would take years of perfect grows

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  11. #26

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    i dont buy it.
    the cmh are 225 quid each, so watt for watt you could have say 4 600w HPS, with MH and HPS bulbs and digi ballast for 360 quid or the equivalent CMH's of which you would ne1ed 8 at 225quid = 1800 quid.

    So for the same wattage output its 360 quid for HPS vs 1800 quid for CMH.

    i'll stick with the old 600s thanks 1400 quid would buy me a lot of leccy, and spare bulbs.

    kinda reminds me of the "great" LEDs which were about a grand for a 1000w kind led say. --Dont see many of them about now either.
    Ive seen CMH in action and they are super bright, but there is absolutely NO way they are worth the extra coin in my humble opinion.

    HPS all they way - Billy the Luddite

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