Response to Hi, Joan M. You'll need the PL5815 18W or PL5808 35W LED Bulb along with the Astrolite Lens Gasket - SPX0580Z2 for the SP580S fixture. For the SP059SL fixture can use the PL5816 LED Bulb, the Astrolite II Lens Gasket - SPX0590G and the Lockscrew - SPX0590Z2A

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