All manufacturers are fighting to increase the brightness of the projected image. Brightness is measured in terms of 'ANSI lumens' and the brightest machines command a premium price. Projectors in the range 300-600 lumens are best used away from direct daylight and with no office lighting. Units in the range 600-1,000 lumens can be used in most office condition away from direct sunlight. Units above 1,200 lumens are ideal for larger offices and conference rooms.
Contrast attracts less attention but is important.
Contrast measures the difference in light intensity between the dark and light areas of the screen. DLP technology units tend to produce a higher contrast image. Return to questions 4. The sharpness and clarity of the image is determined by display resolution. The resolution of a display is given in terms of columns and rows of pixels making up the picture.