This light is almost the perfect size for my 1-gallon vase aquarium. The vase is slightly larger than 6.1 inches in diameter, which is slightly larger than the frame of the 6.1-inch light. However, it sits on top easily without me worrying about it falling in. Adding a small rubber strip along the perimeter of the light would make it fit perfectly. Nevertheless, this was exactly what I was looking for. It was able to light my vase sufficiently for the plants inside to grow well. There are three different lighting intensities as well as three different colors of white. I prefer the highest intensity and the full 6k spectrum for my plants. I like the timer feature, so that I can just select the 3/9/12 hour photoperiod (I will use the 9-hour photoperiod). Most of all, I like that this light is USB powered, allowing me to place my vase anywhere I wanted. Though this light is competitively priced, I still found it a bit expensive. Nevertheless, the round housing with humidity vents is exactly what I was looking for, and I am happy with the product.

Very bright and covers a big space

It went together fine, seems sturdy, and the light has good coverage/brightness. For now, I'm trying to see if it can resurrect a mostly dead plant that was light deprived, but I plan to use this more when I go on vacation along with an auto-watering system I own. My only real complaint is I don't really understand how the timer works. There are 3 LEDs labelled 4H, 8H, and 12H. The timer bottom toggles between each of these, but also has a mode where none are lit. I'm guessing 'none' means to stay on 24 hours a day? I'm guessing if I choose something like 8H, that it means it is going to go on 8 hours every 24 hours? All the instructions say is the following, which to me, just makes everything even more confusing... In ONE 24 hour cycle each color has a different time cycle. * the Red light stays on for 4 hours. it then goes OFF for 20 hours, then back on. * the Green light stays on for 8 hours. it then goes OFF for 16 hours, then back on. * the Blue light stays on for 12 hours. it then goes OFF for 12 hours, then back on.