You didn't say what brand your old light is? Most niches will accept other lights it sometimes becomes an issue if your doing new construction because the UL approval was made with the manufactures niche.
You also didn't mention what type of controller you have. Have you checked out Pentairs website?

I found paperwork that puts the pool install in 1972. I had no idea what the light was until today. I did some measurements and then called a Pentair Tech. My old light has the same design stamping in the stainless trim ring that pentair shows with its Amerilite series. Tech said these have been widely used for many years. I think this is what i have. I have an Intelliflo Pump and just spent my bank account on that and a Quad 60 filter.I was looking for a color light thst doesn't require a controller at this time.I see that the Pentair Sam doesn't need it and have asked about the Intellibrite which sounds like it does need a controller.Can Intellibrite run off just a light switch and change programs by switching like the Sam?
Whats brighter for my application??

The SAM will work on any switch. Changing the colors or freezing a color is done by turning the switch off and on. The same is done on an automated controller. Not an issue as there are only a few color options.

For IntelliBrite, there are about 13 different options and people really don't like to flip the switch that many times. IntelliTouch x.+3(with a current version) is the only way to access those features without the switch issue.

Both lights fit the Amerilite niche. If you have an old Purex niche, it will fit that too. In that era, just about all lights were the American Product light (Amerilite)unless they were the snap in type.

If you are plastering the pool and the niche is not compatible, they can install a current plaster ring and be current with the world.

If the wire is imovable is there any way i could properly drill a new hole through the nich up at an angle to the planter side of the pool concrete decking??

The distance from the niche to the backside of the cuncrete pool decking is only about 4 feet

I think flex "sealtite" conduit could be fished up to the surface in the planter bed!

What would be the best way to seal the new conduit to the light niche to be waterproof??

Anyone with experience with this??

Shure could use the help............Cheers

You can't run flex conduit to a niche. Rigid plastic to a modern niche is ok in the presence of a #8 bond wire which must be potted to the niche itself.

I would certainly not drill a hole in a niche. That cord will come out with enough effort. It may also break. Try pouring a slightly diluted solution of dish soap down the conduit and work on it. There is probably a blue-green build-up in the niche where the cord goes through that is blocking it. You can dig that out with a screwdriver first.

If all fails, a good electrician will get it out. They have all the tricks AND patience.

The old Anthony niche had a compression nut on the inside of the niche.
Some times old cords swell and con be difficult to get out. I've used my CO2 tank with a pressure pop off to blow them loose.

Yahoo!!!!!!!!!! I got the lil Bugger out today and installed the new Intellibrite!!
I used a CRC spray lubricant formulated for Electrical wire that my local (very cool) home depot guy turned me onto. I sprayed about half a can throughout the morning while i pump out the pool below the light niche!.
I an sooo frik** happy about the new install. I'm fillin her up now and should be testing tomorrow evening.
Thanks guys for your input..........Gman