MacBook Pro keyboard backlight not switching off

I recently bought a 13" MacBook Pro (2012, 2.9GHz i7) and it came with Mountain Lion preinstalled. The keyboard backlight isn't behaving as I had expected: when the "Adjust keyboard brightness in low light" option is checked, it does indeed adjust the brightness of the backlight when ambient light levels change. However even when the ambient light is VERY bright (desk lamp shining down) the backlight doesn't switch off; instead it just goes to full brightness. I understand that the backlight usually dims in dark conditions to save battery, but why would it go bright when the keyboard is fully visible without a backlight? Is there a way to make the keyboard backlight go off when there is plenty of background light and come on when the environment is dark?
Thanks in advance for any advice.

Auto brightness operation usually works in the way yours is working.  It is dimmer in very low light and progressively gets brighter as the ambient light increases.  There are cases where this is actually helpful as in wierd backlighting situations.
You can override in the System Settings and from the keyboard "function" keys.  I'm not at my MBP right now, but I think the keyboard backlighting controls are somewhere near F5 and F6.

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