Review on NICREW Submersible LED Aquarium Light for Freshwater Aquariums: Brilliant White and Blue Light Stick for Underwater Fish Tanks by Carol Fowler

I bought two of these for my 48 inch aquarium, one for each lid. attached mine at the top of each lid. They are light but not hot. They do not increase the temperature of the water in my aquarium. Suction cups work best when wet. If you stick them dry, they may lose suction. I wet the suction cups first and they stuck for about five weeks. They don't have a timer, but you can connect them to a timer if you want. Blue is relaxing while white is clean and fresh.