I'm not an expert by any means, but we have replaced 3 of these light bulbs (same Pentair lights as you have) w/ Home Depot or Lowes brands and have had success. Mind you, the wattage is not the same because we couldn't get 250 watt at the store. I didn't even bother to look online since these are working for us. Honestly, the amount of light is not diminished enough to be noticeable, and we have a 46,000 gallon pool. Good luck!