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I would like to lower the intensity (brightness?) on my TI-30XIIS calculator.file:///Users/mkdorsey/Downloads/IMG_4095.jpg 

To make it look more like this file:///Users/mkdorsey/Downloads/IMG_4097.jpg.

The two calculators for comparison: file:///Users/mkdorsey/Downloads/IMG_4098.jpg

How do I change the brightness?