I use a home made 250 watt metal halide (MH) lamp.
MH because:
1. Highest efficiency. Higher than fluorescent.
2. Smaller fixture size.
3. Dependending if you want blossoms or fruits, great selection of color temperature. From 3000 K to over 10,000 K.
4. Long bulb life, about 10000 hours.
dcarch
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