i use the Sun System LEC 315 Boss fixtures with Phillips bulbs. The ballasts are dimmable which I love. I also like all the safety features. They were a bit pricey, $1100 CAD$ including tax and shipping for 2 units with bulbs I agree with Hugo Phurst about the bulbs. Phillips bulbs have the best spectrum, life, and they run a couple of degrees cooler. I've never used the Hortilux, but looking at the specs, I really feel that it is inferior to the Sun System and definitely not worth the $800(tax in) that they're selling on amazon.ca. I love the Sun System ballasts