Philips MainsFit (UL Type B) T8 LED lamps use a double-ended design which significantly simplifies installation, saving time and costs. This product can replace either T8 or T12 lamps in fixtures containing shunted or non-shunted G13 (medium bi-pin) lamp holders. Proven over 40% energy savings over fluorescent systems with an average life rating of 50,000 hours means satisfied customers. Wide beam light distribution (240° beam angle, 350° degree illumination angle) emits 1800 lumens in 5000K using only 12 watts. Not compatible with existing fluorescent ballasts.