High pressure sodium EXTREME HPS-bulbs are designed specifically for indoor enhanced plant growth and flowering. High Pressure Sodium has a light spectrum shifted towards the red, and is used during the flowering stages of growth. Designed specifically for electronic ballasts. High lumen output and a wide color spectrum for maximum yield. Standard E39 Base. 1 year warranty. – 145,000 Lumens! – Designed for indoor use – Light spectrum towards the red – Used for flowering stages of growth – Compatible with electronic ballasts only – High lumen output – Standard e39 base – 1 Year warranty Case Quantity = 20