Our Yield Lab 1000w High Pressure Sodium bulbs are designed specifically for the blooming and fruiting stages of plant growth, due to their red, yellow, and orange wavelengths that promotes a greater flowering response from plants. These HPS bulbs give you 130,000lumens of light and contains 30% more blue spectrum than most other HPS bulbs. Yield Lab 400 watt high pressure sodium bulbs will flower and bloom your garden for up to 24,000 hours and increase fruit and flower volume by as much as 20 percent! * Total Wattage: 400w* Color Temperature: 2100K* Pass UL and CE tests* Fits with all 400w HID grow light reflectors with E39 mogul base sockets* Compatible with magnetic and digital ballasts