Replacement Heat Lamp Element CQ-29Replacement Heat Lamp Element CQ 29 Replacement TDP Lamp Element. Easy to replace the lamp head, no tools should be required, with the electric plug on the power line. 5 inch TDP Lamp Replacement Head features a 4. 5 diameter mineral plate with the original mineral coating of 33 elements. TDP Lamp 5" Replacement Head is equipped with a durable metal screen for added safety. 3 month warranty on replacement element.