Extra low mercury Better for the environment - only 1.7mg of mercury per lamp with ALTO II Technology;Reduce maintenance costs by extending the relamping cycle Philips T8 lamps are energy-efficient lighting solutions. 95% lumen maintenance and reduced lamp-end blackening;Available in multiple wattages: 17W, 25W and 32W;Available in multiple color temperatures: 3000K, 3500K, 4100K, and 5000K Ideal for applications requiring maximum maintained light output.