The Ott screw in bulbs are about $10 and will fit where regular bulbs will fit. I have an Ott light and bought the bulb that said was the same as Ott but cheaper. It was a big difference to me. I stick with the Ott brand. The bulbs I bought years ago for much more then they are now, I paid about $30 per bulb, are still in use. I don't know if the cheaper price Ott bulbs are the same but I sure have gotten my money's worth from the ones I have. I use them over my vanity sink, in my sewing room ceiling light fixture and in our nightstand lamps. DH put one in his shop over his workbench and it's still burning and he forgets to turn off the light half the time.