Philips SDW-T 50W 825 PG12-1 presentation 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.Philips SDW-T 50W 825 PG12-1 have a PG12-1 base type, which allows them to fit perfectly in your old fixtures.The average lifespan of Philips SDW-T 50W 825 PG12-1 is 15000 hours. Use of Philips SDW-T 50W 825 PG12-1 Philips SDW-T 50W 825 PG12-1 will provide a cold white light, corresponding to a color temperature of 2500K. The color rendering index is also excellent, more than 80-89Ra.