Best practices: I am going to be replacing my 500W 120V pool light.

[Chuckiechan]

I see 500W 120V as an unnecessary risk now that LED's and lower voltages are common.
Putting in a transformer seems pretty straight forward.
BTW, are they AC or DC? And what is the recommended output?

 

[chiefwej]

The 110v protected with a GFCI or 12v, either is a safe option. There are LED
options to directly replace the 110v 500w bulb.

https://smile.amazon.com/gp/product/B07NP2ZL1L/ref=ox_sc_saved_image_9?smid=A1TC74TLIB55GW&psc=1

 

[jamjam]

Don't forget that people have been killed in pools with LED lights with improperly installed/maintained transformers that sent line voltage to the niche. If your pool/light is bonded, grounded, and on a GFCI then you are in a safe environment. Both options are mixing electricity with water, proper installation, maintenance and testing is required.

 

[kchinger]

The 110v protected with a GFCI or 12v, either is a safe option. There are LED
options to directly replace the 110v 500w bulb.

https://smile.amazon.com/gp/product/B07NP2ZL1L/ref=ox_sc_saved_image_9?smid=A1TC74TLIB55GW&psc=1

I have some cheap LED bulb with a bunch of colors from Amazon. Works well as a direct retrofit. You just flip the switch a bunch to choose the color (annoying since I can't see the pool, so this takes two people...).

Just realized thought that I don't think it's on a GFCI. What's the easiest way to retrofit this?

 

[Chuckiechan]

I suggest you start a thread as this could possibly be a dangerous condition. You may actually have a GFI you don't know about, but you are suppose to test it monthly So there is that.
The pros can walk you through it.
Post a photo of inside of your pool equipment electrical box if you can.