Will the DEWALT flashlight bulb DW9083 work in the PORTER-CABLE flashlights?

No, the DW9083 should not be used with the PORTER-CABLE 18 volt flashlights. PC18FL is an 18V incandescent flash light and uses a 0.3A bulb only. PORTER-CABLE part # 90534275. If a higher rated light bulb, such as the DW9083, is used it may generate excessive heat which may cause the light housing to deform.