THIS UNIQUE BENDABLE DESK LAMP PROVIDES THREE TYPES OF LIGHT FOR OPTIMUM READING OR WRITING AND TO HELP REDUCE EYE STRAIN BY PROVIDING THE CORRECT TYPE OF LIGHT AND ITS INTENSITY.-COOL WHITE: GENERALLY THE PREFERRED LIGHT FOR READING AND TASK LIGHTING. IT PROVIDES THE GREATEST CONTRAST BETWEEN BLACK TYPE ON WHITE PAPER -NEUTRAL WHITE: ALSO PREFERRED FOR READING AND TASK LIGHTING WITH LESS CONTRAST WANTED- WARM WHITE: PROVIDES A WARM AMBIENT LIGHT SOURCE PROVING THE LEAST AMOUNT OF CONTRAST. 22 1/8" H X 2 3/8" W X 3/4" D