Heat Generated: 600-watt HPS vs. 1000-watt HPS

H.M. Murdoch · Nov 22, 2014

I'm currently using a 600-watt HPS for flowering in one of my grow closets. I use an air-cooled hood with plenty of ventilation. The closet measures 3'9" x 3'9" x 8. I'm getting good results, but the heat is hard to manage in the hot summertime.

Anyway, it's time to buy a new bulb and ballast, and I'm wondering about a 1000-watt HPS instead.

How does the generated heat compare between 600-watt HPS and 1000-watt HPS? If it's almost twice as much, as the additional wattage seems to indicate, then I have no chance of managing the extra heat.

Has anybody tried both, or have direct knowledge of how the generated heat compares?

I did a search and found some comparisons between the two bulbs, but most comparisons dealt with yields and energy costs, rather than generated heat.

Thanks in advance.

patrickkawi37 · Nov 22, 2014

H.M. Murdoch said:
I'm currently using a 600-watt HPS for flowering in one of my grow closets. I use an air-cooled hood with plenty of ventilation. The closet measures 3'9" x 3'9" x 8. I'm getting good results, but the heat is hard to manage in the hot summertime.

Anyway, it's time to buy a new bulb and ballast, and I'm wondering about a 1000-watt HPS instead.

How does the generated heat compare between 600-watt HPS and 1000-watt HPS? If it's almost twice as much, as the additional wattage seems to indicate, then I have no chance of managing the extra heat.

Has anybody tried both, or have direct knowledge of how the generated heat compares?

I did a search and found some comparisons between the two bulbs, but most comparisons dealt with yields and energy costs, rather than generated heat.

Thanks in advance.

My opinion is the thousand is not too much warmer when your air cooling.. You might be able to pull it off, but it's not necessary. a 600watt covers that size space no problem. I do not believe your yield will increase enough to where it would be worth the extra cost\headache of it maybe being too warm

H.M. Murdoch · Nov 22, 2014

patrickkawi37 said:
My opinion is the thousand is not too much warmer when your air cooling.. You might be able to pull it off, but it's not necessary. a 600watt covers that size space no problem. I do not believe your yield will increase enough to where it would be worth the extra cost\headache of it maybe being too warm

Thank you. I agree.

Bb402 · Nov 23, 2014

isn't the heat generated directly related to the wattage? A certain percentage of the wattage is converted to light and a certain percentage to heat.
a 1000 watt should produce 166% the heat of a 600 watt unless a 1000 watt hps is more efficient than a 600 watt, which I think is unlikely since the design is pretty much identical.

Greengenes707 · Nov 23, 2014

Yep it will be almost 2X as much. But if you can extract it quick/agressive enough you could do it.

And bb420 said it very well
600 are 42% efficient...1000 are only 36%...even watt for watt, a 600 is slightly cooler initially coming off the lamp.

But the theory behind heat and btu's is that eventually every photon is converted to heat, wheather it's form reflecting or being absorbed by plants. 1w=3.412btu's regardless of the source type or efficiency of it.

bf80255 · Nov 23, 2014

If you cant control the heat now, why would you add more?? Thowies run much hotter than sixes especially in that small a space i agreevwith these other guys keep the 6

Rifleman420 · Nov 23, 2014

bf80255 said:
If you cant control the heat now, why would you add more?? Thowies run much hotter than sixes especially in that small a space i agreevwith these other guys keep the 6

spot on.

Heat Generated: 600-watt HPS vs. 1000-watt HPS

H.M. Murdoch

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patrickkawi37

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H.M. Murdoch

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Bb402

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Greengenes707

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bf80255

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Rifleman420

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