was using an old fashioned Angle Poise lamp on my desk but decided to try this instead. It immediately gives off much more light than the old desk lamp (halogen 20 W). I can choose between warm white, warm white or brilliant white colors. You can dim and brighten the intensity according to your individual needs. There is also a built-in sensor that can automatically adjust the brightness based on the ambient light conditions. I use this light in the corner of our lounge, fairly bright (middle area) in a warmer colour, but then tend to use it in a bright, cool white when using my PC. So it's used in anger as both a task light and an all-purpose backlight when we're watching TV. Very versatile and useful. A bit pricey to be honest, but it's a quality metal construction. Mine sits well on my particular Samsung monitor, but I could imagine it being annoyingly wobbly and easily dropping onto a much thinner monitor, such as an iMac screen, which has very thin, tapered edges. You'll need a fairly thin top edge of your screen so it's stable and doesn't fall or move when you use one of the touch-sensitive ones