EcoSmart 40W Equivalent Bright White (3000K) A19 LED Light Bulb (4-Pack) $19.97 you can get free shipping orders over $45
EcoSmart 40W Equivalent Bright White (3000K) A19 LED Light Bulb (4-Pack)-ECS GP19 WW 40WE 120 at The Home Depot
Home depot has these for about $5 a bulb.
We have lots of these the are dimmable and are brighter than a 40 watt std bulbs
50-57 watt is my guess I replaced many 60 watt bulbs with these.
Five year warranty