Response to Hi Jon, Yes this would mean you just need to replace the bulb we do see where you ordered the PL5808 bulb and our suggestion was the PL5810. We are not 100% sure if the PL5808 will fit in the SP-561 but we do know that the PL5810 will. I would suggest trying the PL5808 bulb first as if it does fit in your housing then it will be brighter than the PL5810. If the PL5808 is too large then you can return that bulb and use the PL5810 which is a little smaller. We would also suggest replacing your Hayward DuraLite Lens Gasket.

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