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