Interlux is a well-known brand for its innovative products that are tailored exclusively to the needs of indoor gardening and hydroponics. Interlux bulbs are designed for indoor growth. The Interlux DualARC 600W HPS and MH Bulb provides two light spectrums in one high intensity discharge bulb: a cool, blue MH light and a warm, red HPS light. They provide the same DualARC in 1000ws for... https://www.hydroponicstown.com/brand/interlux