The Ledvance led a 100 p 13w 840 4000k frosted e27 classic bulb is the ideal replacement for your old A100 incandescent bulb. It offers a number of advantages over traditional incandescent bulbs. · · · Low energy consumption · · Easy replacement of classic lamps thanks to compact design · · Instant 100 % light, no warm-up time · · Professional LED lamps for line voltage · · Not dimmable · · Lifetime: up to 15,000 h · · Good quality of light; color rendering index Ra: = 80; constant chromaticity