600W MH HIGH OUTPUT InterLux LIGHT BULB – Metal Halide bulbs produce a blue spectrum light that is used during the vegetative stage of growth. Giving your plants the right light for each growing stage makes them strong.. Tested and developed to work perfectly with electronic ballast. High lumen output and a wide color spectrum for maximum yield. Standard E39 Base. 1 year warranty. – 600w Metal halide bulb – Designed for indoor use – Light spectrum towards the blue – Used for vegetative stages of growth – Designed for use with hypotek electronic ballast – High lumen output – Standard e39 base – 1 Year warranty WORKS ONLY WITH DIGITAL BALLAST Case Quantity = 20