Semi-spiral Integral Ballasted CFL239-SPA-LSubstantial enrrgy saving up to 80%.Long life with lumen attenuation.High light output efficiency.Even light distribution, excellent color rendering.Instant start and flicker free.Sizes and wattages in a wide selection.Both warm and cool color are available and color temperature can be customized15W,18W,20W,23W,25W Semi-Spiral Integral Ballasted CFL