Hi Matt,
Welcome to TFP! This is a topic many of usdeal with. If you can clarify that you’re wanting to pull a completely new light assembly (you have a leak or?), or just want to replace the light bulbs themselves?
Are you wanting LED? Color changing for the neatness of it? Just curious
. I’ll go under assumption that your light niche is a Pentair/American Products Amerilite from your mention of Pentair?
If the assembly/fixtures themselves are still watertight, there are a dizzying array of bulb selections. Swap the bulb and gasket and you’re good to go, but the color changing bulbs are $75+.
I went with Bulbwizards, Made in USA and excellent warranty service. They offer a 12v option also. It’s just a Edison screw in bulb. The Pentair Intellibrite 5g and others as you mention don’t have the replaceable bulbs so you’ll pull an entire new fixture, and many have had serious issues with them. Some only lasting a few months.
IMHO, if your fixtures are working and less than 10 years old find a nice Bulb and new gasket but if you need a new fixture (again IMHO) get a direct replacement halogen Amerilite and pull the halogen out and replace with a Bulbwizards or other LED bulb.
I’ll preface that I tried color changing bulbs and because of pool color brightness, I went back to normal white bulb in my spa and I’m much happier. Just waiting for my Bulbwizard Pool light to die...but 2 years now and it’s good. The LED tech is a ‘get what you pay for’ situation. They may say 50,000 hour life, but the electronics, solders and PC boards fail before the filaments do, so you’ll be replacing just as if an incandescent. The quality bulbs will last longer. You can get good white LEDs, but they can run you $$, Also. I wish I had more specific info on bulb manufacturers. You can get a run down on Inyopools.com that stocks quality products.
See if this bump will get others to also put in their $0.02
Also, if you can fill in your signature field (read link below ‘before you post’) to let us know what pool equipment you work with.
https://www.troublefreepool.com/content/115-read-before-you-post
-Kevin