Agrosun 1,000 Watt Double-Ended HPS Bulb, 2,100 KAgrosun Double Ended HPS lamps are ideal for cultivation with high light intensity requirements. They provide high proportions of both red and blue light, which guarantees efficient, solid growth. Specifically designed for high frequency electronic ballasts, their high output of PAR light (2100 mol s) promotes photosynthesis. Made in the EU. Lamps must be operated on ballasts and luminaires that meet all applicable ANSI specifications. External