These Eye Hortilux Super High Pressure Sodium (HPS) bulbs provide 25%
more lighting energy in the violet, blue and green lighting spectrum
than traditional high pressure sodium bulbs. The combination of Super
HPS and the Metal Ace conversion bulb provides the optimal lighting
spectrum energy levels throughout every stage of plant growth. The "EN"
designation means that this bulb is environmentally friendly in that it
passes EPA and TCLP test criteria as non-hazardous waste.