Our Yield Lab 400w 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 55,000 lumens 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!

Specifications:
Warranty: 1 Year

Power: 400 watts (High efficiency)
Expected Life Span: 24,000 hours
Lumen: 55,000 lumens
Color Temperature: 2,100K
Contains 30% more blue spectrum
Best choice for Plant Yield
High output, high luminescence efficiency
Fit for all standard 400 watt HPS grow light systems
Pass UL and CE