These standard 400 Watt HPS bulbs are a great value for the price. High pressure sodium bulbs burn in orange to red portion of the visible spectrum. HPS grow bulbs are preferred by most gardeners to used used during the flowering portion of their grow. These standard 400 Watt HPS bulbs can be used in any 400 watt HPS ballast - "coil and core" or digital.
Specifications:
Initial Lumens: 50,000
Bulb shape: ET-18
Wattage: 400
