Leader Lead 5W Dimmable R50 LED E17 Light Bulb, 40W Incandescent Bulbs Equivalent, 350lm, Daylight White, 5500K, LED Light Bulbs, Pack of 4 Units Dimmable with E17 socket, 4 units for a pack. Perfect standard size, replace 40W incandescent directly. Save electricity bill. Replace 40W incandescent bulb by 5W LED. Save over 80% on electricity bill of lighting. Long life span. Lowers maintenance costs by reducing re-lamp frequency and save your trouble. Eco-friendly and no UV radiation.