The F28T5 lamp is a 28 watt T5 programmed start linear fluorescent lamp. CRI of 85 and 35,000 hr life at 12 hours per start. Choice of color temperature between 3500K, 4100K, 5000K and 6500K. Miniature Bi-Pin (G5) base. Approximate initial/mean lumens of 2900/2700. Sold in case of 25 pcs.