My Hayward Pool light is not working correctly. When I turn it on it goes to a pink color. It is very faint and doesn't light up the pool. We typically keep it on the dark blue color. If I try to change the color, it stays pink. Any thoughts? If I have to replace it, do I just replace the bulb or do I have to spend over $1,000 for a whole new light system? Thanks for your help!