Philips SDW-T 35W 825 PG12-1 Specifications The Philips SDW-T is a compact high pressure sodium (HPS) discharge lamp with a warm white light and excellent color rendering. It is only compatible with conventional ballast. With their PG12-1 base, Philips SDW-T 35W 825 PG12-1 can be easily integrated into luminaires, and allow you to replace your old inefficient halogen lamps.With a long average life of 15000 hours, Philips SDW-T 35W 825 PG12-1 halogens are economical and do not require frequent replacement. Use of Philips SDW-T 35W 825 PG12-1 Philips SDW-T 35W 825 PG12-1 will provide a superior quality light, with a color rendering index superior to 80-89Ra. The light emitted will be warm: 2500K.