Philips Ceramalux High Pressure Sodium light bulbs have little or no lead in their glass or bases, and are produced with little or no mercury. Many of these HID products also offer additional features such as energy efficiency and long life, and are packaged using recycled and/or recyclable materials. Philips high pressure sodium lamps that are designated as ALTO pass the U.S. EPA's Toxic Characteristic Leaching Procedure (TCLP) test for hazardous waste determination.