Philips 315w 98v T12 Clear PGZX18 Mastercolor CDM-T Elite Agro HID Light Bulb HID Bulbs produce high output for their size making them a compact powerful &amp; efficient light source HID Bulbs are used for general lighting, professional lighting fixtures, growing applications HID bulbs put out around 3-5 times greater output (lumens per watt) than traditional halogen bulbs Philips T12 bulb, 315W, Base: PGZX18, Rated Life (hours): 20000, Color Temp: 3100K, Luminous Flux (LM): 33000