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25 Watt Replacement UV Bulb may be used in a variety of insect/fly lights but according to the manufacturer, Catchmaster recommends you use their bulb in the Catchmaster 911 Insect Light Trap because of the special connects. According to Catchmaster, if you purchased your Catchmaster 911 InsectLight Trap prior to July 2012 then you need bulb 911B or 911SPB. If you purchased your light after July 2012 then you need bulb 911HB. If you would like price and availability of these bulbs please give us a call at 866-581-7378.