HQI will put out approx. 1.6 times the candle power of a mogul halide, and the colour spectrum will not fade as fast as a mogul will. The HQI should however be mounted no closer to the tank than 9-12 inches. This makes it difficult if you like canopies. Look for retrofit units if you have a canopy, they will save you $$. I have not seen HQI in retro form.
Rick
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