Edit update: epic has 2 brightness settings, not 3. Could possibly be because epic is running touchwiz 2.5 and not touchwiz 3 like the rest of the galaxy s phones. There are 2 brightness settings. One is in settings>sound and display. The second is in the stock browser. Open the stock browser. Press menu. Select "more." Then select brightness setting. This last one does not apply to Epic. Finally the 3rd, if you want to adjust the brightness and color tone while watching videos. Open your stock video player, select a video to play. Next, click menue. Then select brightness. You can also change the tone by selecting "color tone." I personally prefer the "Warm" setting.