Growstar 90w Mcob Plant Grow Light Lamp for Greenhouse, Hydroponics, Greenhouse Modular design. If the LED bulbs breaks, our product is designed for easy change. Special fans vest design, with 4 cooling fan, Light won't generate any ultra heat even works 18hrs a day, keep light has longer service life. The air vent sides shaped as a window-blinds is to Avoid water dripping. Wavelength (11 band): 430~440nm, 450~460nm, 460~470nm, 610~615nm, 620~630nm, 650~660nm, white 6500K, 380~400 nm, IR&UV included, great function on plants growing. Suitable for every stages of plants. On/Off switch is on the side of the light, don't need to cut off the power while you need to turn off the light.All plugs and VDE have passed the UL certification so that there is no need to worry about the safety problem.