One of the best dedicated horticultural bulbs available today, the Grolux Sylvania 400w offers one of the highest outputs available from a HPS bulb for plant growth. It is primarily a flowering bulb, but it has a good helping of blue spectrum light too for vigorous plant growth.
Grolux bulbs by Sylvania are highly regarded and will substantially increase your harvests. You can also grow under this lamp during the vegetative stage due to the higher amount of blue light added.
This bulbs operates at 2050 Kelvin and has an E40 type fitting. Rated for 24,000 hours of use.
Also available in 600W - See Grolux Sylvania 600W HPS Bulb / Lamp.
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