Easy Installation: Small appearance C35 led filament style bulb with an color blue light, standard (Medium) base fits all E12 light fixtures, make your room even brighter. Energy Saving: 4W led light bulb can output 400LM bright blue light which is equal to those common 40W incandescent light bulb. Efficiently save up to 80% on your electricity bill. Wide Application: It prevents the normal production of melatonin when getting up at night and can be used for decoration in kids room, party , Halloween, Christmas, etc. Good for plant growth as well. Long lifespan: It is made of high-standardized materials, which can last for at least 30000 hours. No need to worry about replacement. Premium Standard: Flicker-free, noise-free, dazzling-free, no mercury, UV, IR or any other harmful material. It takes no time to wait for its full brightness. We promise you’ll receive 100% well-qualified bulbs.