Philips 281931 F17T8/TL865/ALTOII 17-watt T8 linear fluorescent tube lamps are incredibly powerful, environmentally responsible, long life lamps with an ultra-slim profile. This translates into reduced maintenance and disposal costs and also allows the use of smaller fixtures, which reduces ceiling clutter. It has a stark color temperature of 6500K. Philips leads the industry with the lowest level mercury technology in its ALTO line. Reducing the mercury level (source reduction) during the manufacturing phase is essential to creating products that are less harmful to the environment.