"The product works great. I ended up ordering it because I couldn't fit a 150wt zoomed bulb in the normal fixtures, this one holds it great with plenty of room to spare at the bottom. It has the convenient on and off switch, and shipping was quick. The reason it got 4 out of 5, is because the size is a blessing and a downfall. It's so large it looks weird on my 20L tank, but worth the weird look and looks great on my 40 breeder. I would, and have, buy more of these. Also, it makes it possible to buy cheap halogen lights from a home improvement store, so it saves you money in the long run."