Apollo Horticulture 6 Watt Hat LED High Intensity Clip On Head Cap Green Light 1 - Apollo Horticulture 6 Watt LED Clip-On Hat Light Dimensions: 3.5" x 2.25" x 1" 6 High Intensity green LED bulbs for extended viewing range. Our cap light is water resistant with over 100,000+ hours of burn time. Our cap light will not disrupt your garden's photoperiod cycle, making it perfect for professional or recreational use. Four effective lighting options (2,4,6 or strobe) to keep you in control of your lighting situation.