If there were any stars, this would be my choice. Both the green and the red that I tried were unacceptable. Firstly, the brightness was almost nonexistent. The duration was nonexistent, and finally, the light was not throughout the entire area. I bought them because I had packets that were from 7 years ago and I was worried that they wouldn't work. In the end, I resorted to these, which were clearly more effective.