You can easily switch between a brighter general light and a softer mood light by just pulling the strings. Gives decorative patterns on the ceiling and on the wall. Light bulb sold separately. IKEA recommends LED bulb E27 globe clear. Use a clear light bulb if you have a lamp shade or lamp with a perforated or cut-out pattern or other airy, open design and want the pattern to cast effects on the wall and ceiling. Use an opal light bulb if you have an ordinary lamp shade or lamp and want an even, diffused distribution of light.