Kamla, It's for a 29gal tank that's about 24x16x18. Each of thoese bars is 2.5" in width, just over the size of the reflectors, so there is about .5" between each reflector. Thats why I also cut the spaces inbetween the bars so that I could get some air flow around the bulbs and reflectors. It was pretty tight in there befor I did that. I'll take some more pics as soon as I get the cammera. I'll be sure to take some so that you can see how close the reflecors are to each other.
BigJPDC, It's working pretty good so far. I'm one of thoes reefers who can't keep their hands out of the tank, so it was a must.