Cobalt Replacement Lamp Assembly - In response to market changes and customer demands, Projector Doctor presents Cobalt Lamps. We confidently recommend these lamps as they are built with burners and reflectors manufactured only by the major industry suppliers. We have tested and endorsed these lamps to the point we are now including a longer total warranty period of 120 days. No company in the world repairs the variety of projector brands and models as does Projector Doctor. Therefore we are among the best to rely on for an endorsement on replacement projector lamps.