A special coating of titanium dioxide is what gives fresh2 the ability to break down odors. When the surface of this coating is exposed to fluorescent light, a photocatalytic action occurs. The reaction emits electrons - negatively charged particles - and simultaneously,positively charged holes form in their place on the glass surface. This creates very strong oxidizers that completely break down odors. Purifying begins to work 10 minutes after the bulb is turned on. Use in standard medium base sockets (i.e. in a standard household lamp).