Philips T5 Circular lamps are ultra-slim with improved color rendering, higher efficacy, and longer life.T5 HO circular lamps offer extraordinary light output., This circular TL5 lamp (tube diameter 16 mm) offers extended design possibilities. The slim tube allows the creation of extremely flat luminaires and enables omni-directional light distribution. It is suitable for a wide range of professional and semi-professional applications, and is ideal for use in shops, offices and public areas with unconventional layouts.