The A Series II LED lights from Chihiros are specially designed for densely planted freshwater aquariums. The individual LEDs have a color temperature around 8,000 Kelvin & are arranged in 3 rows across the entire lamp to ensure a well-balanced illumination as to not cast any shadows. The LED are equipped with a built in Bluetooth controller. This differentiates the A Series II from the A Series, which requires an external device to change the spectrum. The app allows you to easily set the timer, light intensity, ramping time sunrise/sunset via “My Chihiros” app. With a width of 6.7cm(2.64in) & height of 1cm(0.39in), these aquarium lights are slim in design, making them look sleek on your aquarium focusing more on plants & livestock. The lights are attached to a transparent acrylic holder so no metal brackets or legs taking away from the beauty of your planted tank, also acting as an indirect heat sink. The A Series II features a swivel to adjust the LED giving the aquarist a wide range of options for illuminating an aquarium in any direction. Note: The max glass thickness for the acrylic stand is 8mm.