Why has my iMac screen become so dark with Yosemite?

The monitor on my (early 2009) 24" iMac used to be overly bright.  I had to use Shades to darken it and make it tolerable.  Now, after installing Yosemite, it is way too dark and I have no way to make it brighter.  The Display brightness control is of little use.
Any comments are most welcome.
Thanks!

Hi crazy,
The computer is in a room with a South facing window directly behind the computer monitor.  The shades are usually closed due to the contrast from the window.  I used the Mac app Shades for years to darken the monitor and it worked great.  However, as I mentioned earlier, when I upgraded to Yosemite, the screen screen brightness was reduced by at least one-half of what it formerly was.  I did upgrade Shades, but it is of no use now since its purpose was to darken the monitor.  Too bad it cannot brighten the monitor.
I am not certain exactly what you mean my your last statement.  Perhaps I answered it in my above comments.  Let my know if you need more info.
Here is the link to Shades for your perusal:  http://www.charcoaldesign.co.uk/shades
Phillip

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