How high are you running your tek light? I'm designing a canopy and I'd like to keep things as low profile as possible. Please mention if you're measuring from the water or from the rim.
if you run a 4 bulb set up, you will be fine. I run a 2 bulb and I aim the reflectors where I need themI'm surprised to hear most people are running them that low given the adjustement range of the legs (which I've purchased and won't use...they'll be available for sale once I finalize my setup). The legs give you a minimum height starting at about 5 inches and go up to about 10.
Would you rather run them higher? In other words, is the light distribution in the top of the tank adequate at that height?