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Could you tell me why you must have the Metal Halides?

The reason I'm asking is that you will achieve the same plant growth with Giesemann Midday T5HO using much less electricity, and with very, very little heat.

VHO has 2 downsides. First it's actually very inefficient due to the fat T12 tube. Second there is barely a choice of bulbs - all of them with unknown spectrum and labeled in Kelvins that don't make sense when you actually see the bulb working.

--Nikolay
 

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330 watts (6x55) watt PC will make a lot of heat, trust me.

You can get the same amount of light (if not more) with 160 watts of the T5HOs.

Also the Kelvin rating and spectrum of PCs is questionable.

--Nikolay
 
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