New for 2013! Bulbrite 50W (Watt) 120V (Volt) plant growth bulb provides natural light to assist in plant growth. For use in professional and consumer greenhouses and indoor gardens. Used to develop seedlings. Bulb life 2000 hours, R20 bulb shape, MOL (length) 4", instant on, fully dimmable to 0%, 100% mercury free, environmentally friendly.