24" iMac Brightness Query

First of all, I must say that I am ecstatic with the arrival of my refurbed 24" iMac. It arrived in perfect condition and is working flawlessly. Whoever owned this previously must have taken very good care of it or not used it at all. Or it may have been a demo.
My question is this: Is there some app that will dim the monitor down further than is possible with the built-in monitor dimmer?
I have the monitor dimmed down as far as I can, but it is still too bright for my eyes. White backgrounds just seem to glare from the brightness. My old 17" PB seemed way too dim to me, but this new iMac is extremely bright for my eyes.
Thanks,
Phillip Anthony

Yes, Photoshop is very important to me, meaning that a correct monitor color profile is very important for all the obvious reasons.
When I selected Color I was surprised to see an 'Adobe RGB' auto setting. I chose this and the monitor got lighter yet. Not what need, but I left it as such.
We uprights, it seems, are never happy with what we have.
Just ran across this bit of info:
"The reason apple limits the brightness is because the lighting on a flat display such as that of an iMac or laptop is that if too little power is supplied to the light it will become damaged ... "
And this may be of some help as well and it's free to boot:
http://freeverse.com/mac/product/?id=7013
Thanks again.

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