These long-lasting, 48" fluorescent bulbs consume just 28 watts of energy to create 2,725 lumens of cool, white light. Designed to provide you with 24,000 hours of light, these T8 fluorescent bulbs use medium bi-pin sockets to connect to fixtures. Fluorescent bulbs are rated at 4,100 Kelvin and have a CRI of 85. TCLP compliant and meets RoSH standards.