I will advise for adj replacement bulb ADJ Products, Replacement Light Bulb, 20W Ultraviolet Replacement Bulb (24 IN) LL-F20BLB https://www.amazon.com/dp/B01DG4O0SO/ref=cm_sw_r_cp_api_glt_fabc_FJTM78DPBG6S36T6AHZT