My pool has a light system called Aqua/Lamp that I believe is made here in Canada. I have two regular incandescent bulbs that appear to run off of 12VAC. I would like to put in coloured LED RGB bulbs. They are available for this system but the LED bulbs are $250 each, compared to about $30 for the plain bulbs. I am quite familiar with different types of coloured LED bulbs, like Philips Hue, etc and this premium for coloured LED is ludicrous.

Is it possible to get other pool LED RGB bulbs that would run off of 12VAC? They would need to fit in my system. Here is what the current bulb system looks like:
aquaparts_01.jpg

Would there be other coloured bulbs that would fit in this system?