This is really fairly simple to do. Acquire a Styrofoam cooler large enough to go over two of your largest mixing bowls. Mine measures 20½ by 13 inches by 11½ inches deep. Discard the top which is not used. Install a porcelain bulb holder centered inside the cooler and attach a power cord to it. Attach an ordinary dimmer switch into the power cord side of the power cord. A standard 25 watt bulb is completely adequate for all your needs.