Compact Fluorescent Spiral Energy-Saving Bulbs are the very latest in light bulb technology. Now you can have the very best light the fluorescent has to offer with up to 70% energy-savings over your current incandescent bulbs. These bulbs pay for themselves in energy savings alone within a couple of months. 120v/230v,15w,18w,20w,25w It is suitable for assembing reading lam, ceiling light and wall lamp as well as lihgting shope, hotel, work shope and office.