I use CoralVue electronic ballasts on all of my tanks. I liked them so much that I became a dealer. I am also an IceCap dealer but I still prefer the CoralVue ballasts. I really like the new verions (they are epoxy filled). The CoralVue ballasts do NOT have an on/off switch (that would just make one more failure point). I have mine on a digital timer that has a small push button that allows me to turn them on/off whenever I need to outside of the programmed on/off times. The 175 watt comes in three versions (1 bulb, 2 bulbs or 3 bulbs driven), the 250 watt comes in two versions (either 1 or 2 bulbs driven) and the 400 watt only comes in a single version (1 bulb driven). If you have any questions about any CoralVue product, please do not hesitate to call me.