The Aquael Leddy Tube Day & Night LED tube emits a "daylight" spectrum with a color temperature of 6500K, ideal for maintaining your aquatic plants and highlighting your fish. It incorporates two-color LEDs (white and blue), and you can choose from three lighting modes: Day with Sunny 6500K white LEDs, Night with blue LEDs for a moonlit effect, and Dawn/Dusk with white and blue LEDs (daylight output reduced by 50%). To switch between modes, simply turn the LED tube off and then back on within 5 seconds using its switch. The Aquael Socket Link Duo Wi-Fi controller allows you to select your desired mode from the Aquael Aqu@rium smartphone app. This accessory is sold separately. The Aquael Leddy Tube Sunny Day & Night LED tube is 100% waterproof for your safety and that of your fish. If it were to fall into the water, there would be no risk of electrocution. Installation: The Aquael Leddy Tube Sunny Day & Night LED tube is designed for installation in a freshwater aquarium. To install this light in the sockets of your old T5 or T8 fluorescent tubes, you will need to purchase T5 or T8 adapters. These accessories are sold separately. Usage tips: To prevent algae growth when installing your Aquael tube, reduce the lighting duration by half and gradually increase it day by day. We recommend not exceeding 10 hours of lighting per day.