2900 Lumens CRI 82 G5 Miniature Bi-Pin Base 45.8 in Length x 0.625 in. Diameter The ALTO Philips 23085-4 F28T5/835/ALTO 28-watt T5 linear fluorescent tube Lamps are incredibly powerful, environmentally responsible, long life lamps with an ultra-slim profile. It has a warm color temperature of 3500K.