Black lights occupy the lowest and least visible spectrum of light, and do not compete well with other types of light. A black light will only work well if there is no other light present in the area being lit. It takes a lot of power to create a small amount of black light. Incandescent black lights are not nearly as powerful as fluorescent black lights because fluorescent lights have a built in transformer that allows the "power" to be stepped up considerably. Incandescent lights are rated according to how much power they use, but a 150 watt UV black light will not be nearly as bright as a typical, white 150 watt light bulb that you might use in a table lamp. If you are lighting an object or area with black light, it's important to note that you should use as much black light as is practical. There is almost no such thing as "too much" black light.