Beaver Creek, Yukon
The fluorescent bulbs may be a solution to your problem. They are very efficient light producers, producing about 65% of the light per watt as HIDs. More importantly, they use a much smaller vertical space than HIDs. However, they do produce the same amount of heat per watt. To prevent the heat from reaching the garden, a glass barrier should be placed between the lights and the garden. The light space should then be ventilated to eliminate heat buildup.
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