I have a ballast in my bedroom with three 60 watt led lights in it. The switch they are connected to is a brand new Lutron dimmer specifically made to work with led lights. The hissing is constant even when the lights are not dimmed, but it seems to get slightly louder when dimmed. I switched out the old dimmer to the Lutron in hopes it would stop. Their use to be a ceiling fan connected here. So I've come to the conclusion that there is just way to much power running to the lights hence the sound. Does this sound accurate? How would i reduce the power running to it to test my hypothesis?
You have two options, get rid of the dimmer or try different LED bulbs. All LED bulbs hiss when on a dimmer, some bulbs hiss much louder that others. A led compatible dimmer will help reduce the amount of hiss but it will never get rid of it.
Here is an article that compares a couple of different led bulbs and dimmer switches. It looks at the quality of light and the amount of buzz each bulb makes with different types of dimmers. http://www.cnet.com/news/which-led-light-bulbs-are-best-for-dimming/
Some combination of the switch, ballast and lights you have may not be 100% compatible.
Take a look at Lutron's LED Selection Tool. You can pick the dimmer and the lights you have and then you can pull up a PDF report for the testing they have done.