Newbee - too much brightness

Hi,
I'm a newbee on those kind of machines (sorry, was on ***** called Pc) and recently have bought a IMac Intel 24".
I wonder how to adjust / set the brightness on the display because too too bright. The brightness is on mini but need to set it lower.
I have read some topics (but I'm learning Mac) and seem to launch the spyder software. Is that on the Imac or have to buy it ?
Is there any simpler way or program on IMac to do that ?
many thanks and glad to got THE machine.

pete mark wrote:
Lobby- Does DarkAdapted work the same way? I'm thinking it has
more potential because of independent color RGB slider choices.
I've not looked at DarkAdapted (I no longer have the problem since
upgrading from ALU 24" to white 20"), however, I believe it must do
something similar -- because I believe the adjustment range of the
backlight is hardware-limited to just what you see on the keyboard
brightness controls.
The easy way to tell is with /Applications/Utilities/DigitalColorMeter.
Watch the "*RGB As Actual Value, 8-bit*" of a pure white background
while "reducing the brightness" with DarkAdapted or Shades. If the
readings don't remain at 255,255,255 the software is chopping-off
the top of the dynamic range and compressing the color depth to
something less than 8-bits.
This is not a slam at DarkAdapted or Shades -- they're just doing
the best they can within the hardware limitations imposed by Apple.
Looby

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