Response to Your fixture is the SpaBrite by Pentair with the R20 type bulb, yes, you can use the Bulb, Floodlamp 60w-120v (R20fl100) - 79108000 you will need to replace the Lens Gasket for Pentair SpaBrite, AquaLight & Sal Light (79108500) O-344 when you replace the bulb or whenever you remove/open the lens from the fixture. Please see How to Replace a Pool Light Bulb 

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