Where does it cost $1500 bucks to change a light bulb? Polychlorinated biphenyls (PCBs) are one of the most useful chemicals ever invented. Big surprise LED manufacturers make ridiculous claims about lamp life; what else is new. And we talk to Marty about the limits of LED's in hazardous locations along with the challenges of sourcing parts and materials for existing legacy lamps and ballasts which still dominate these applications.