PAR-TEK Grow Light Bulbs are made from the highest quality material and workmanship in the industry. PAR-TEK Grow Light Bulbs are manufactured in a technologically advanced factory with strict quality control. PAR-TEK Grow Light Bulbs have been fine tuned to optimally operate when paired with our PAR-TEK Digital Ballast line. PAR-TEK Grow Light Bulbs technology allows for use on both magnetic core and digital electronic ballasts that are ANSI standard. PAR-TEK Grow Light Bulbs have enhanced blue and red spectrum for optimal horticultural plant growth. PAR-TEK HPS Grow Light Bulbs are able to be used throughout the entire growing cycle. Here are some specifications: Initial Lumens / 92,000 lm Rated Life / 28,000 Hours Warm up Time / 5 Minutes Correlated Color Temperature / 2100K Color Rendering Index / 22 Universal Operation Position PAR Value / 1050 Umol/s MSRP $104.95