Review on Beamswork Timer Aquarium Freshwwater Extendable Fish & Aquatic Pets for Aquarium Lights by Joe Pettigrew

I have purchased several of these lights and I think they go well with my 20 gallon tanks. I love that it has a moonlight mode with blue LEDs and a daylight mode with white, red and green LEDs (most other brands don't have a green one). If you get the optional timer module, independent moonlight and daylight timers allow you to overlap the moonlight and daylight modes, allowing you to turn on all LEDs. I really think they should just put in a timer module instead of customers paying extra for it. This is docked with a star for "value for money". One problem I had with two devices was that the power supply failed after about a year. The symptom is that the lights are constantly flashing on and off. At first I thought it was a light block, but after buying a replacement and trying a new adapter with the old light, the flashing stopped. Just recently my second device also started flickering and I tried swapping out the power supply which again fixed the problem. If you encounter this problem, first try replacing the power adapter (12V/1A; 5.5mm/2.1mm plug) before ordering a new lamp. This issue reduces the "longevity" stars in my book.