"Whether you"re looking to increase bioluminescence, activate photosynthesis, recreate the warm tropical sunlight of the photic zone, or penetrate with beautiful, ultra-crisp, white light, SunPaq Lamps are state-of-the-art. More than industry leading, they"re out to set a new standard; boasting 3-times the light output of standard fluorescents with double the life (12 months).The 65 watt Daylight features a 6700k Daylight phosphor for color enhancement and gold-plated, corrosion-resistant pins (square GY10Q configuration) for improved conductivity."21.25 in x 1.75 in x 1 in65 watt