Size:4-pack Ecosmart 9 watt (40 watt equivalent)compact fluorescent bulbs that uses 77% less energy than a standard 40w incandescent bulb. The energy savings over the life of the 4 bulbs is up to 48 or 7 per bulb. The bulbs are a 2,700K Soft White color and last up to 9 years each. Ecosmart bulbs use up to 70% less mercury than standard CFL's. Ecosmart CFL bulbs are Energy Star rated.