IPower Double Ended HPS Bulb. High red and blue spectral ratios for good photosynthesis efficiency, Provides 35% more available energy than the high standard pressure sodium lamp. Great lumen output for high PAR values. Specifically designed for high frequency electronic ballasts.Optimized spectrum encourages flowering growth. Used in iPower Double Ended Complete Fixture. Provide the best coverage and light. Features high red-orange spectral ratios for great photosynthesis efficiency and healthy plant growth. WHY OUR CUSTOMERS KEEP SHOPPING WITH US. SECURE & HASSLE FREE SHOPPING. The item "IPower 2-Pack 1000 Watt Double Ended High Pressure Sodium HPS Lamp Bulb 2000K" is in sale since Monday, October 29, 2018. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Hydroponics & Seed Starting\Grow Light Bulbs". The seller is "hpsgrowlightstore" and is located in Duarte, California. This item can be shipped to United States.