This is a Philips Master LEDbulb 4w P48 DimTone Round E27 with a 2700k - Extra Warm White colour output. This lamp is fully dimmable in any 240v type application with a dimming switch. Unique features of this lamp are the more you dim the light the warmer white it gets. In simple terms the light when dimmed down is 2200k as opposed to 2700k at full light. Specifications for this lamp are: 4w equivalent to a 25w incandescent, 250 lumens, 25,000 hour average life. This lamp is part of the ultra-reliable diamond spark range.