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I had huge heat probs and the final clincher was fitting a piece of 3mm plexiglass a few inches under the lamp, effectively dividing the room into two compartments, with a pipe to the exhaust in the above section where the lamp is.

I checked up on plexiglass light transmission propertiesd and it allows 97% through, even more than glass.

I dropped about 8C and have been smiling ever since.

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