These light bulbs are mainly used for indoor lighting. They are energy-saving light bulbs, the 9W can replace the traditional 60W incandescent light bulbs, estimated yearly energy cost 1.08 dollar. They are also very bright, the color temperature is 5000K daylight, we recommend that you install it in the bathroom and laundry room. The lumens of these bulbs is 800, it can makes your room brighten. The lifespan of these bulbs is 15000 hours, we guarantee you every bulbs has been rigorous tested before shipment. We stand by our words with our 2 year unlimited warranty.