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You could fit a wall-to-wall plexiglass shelf sealing off the hot air between the light and the growing space below.
The lamp will need exhaust ventilation though.
I did so and reduced my heat by about 8 degrees celcius.
Plexiglass has a light transmission of about 97% from what I've managed to google, higher than glass because it refracts less.

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faithlessxxx Reviewed by faithlessxxx on . Help! Plant growing like Weed I'm in need a immediate help. I have 5 females and 1 is twice the height of the other 4. I have raised the light as far as it will go. Plant top is approx. 12" from light. What can I do so my girl doesn't get burned? My hydro store recommended Bush Master. Any advice would be appreciated. See pix. Rating: 5