The next screen analyses the ambient light, you should ensure the Spyder is plugged in to the USB port and insert the unit in the desktop cradle. The Spyder measures the ambient light and makes a recommendation.
In my test the reading was Medium with a brightness of 180 cd/m^2 and a white point of 6500k. You can choose to keep your own current settings or accept the suggested settings. I have accepted the suggested settings.
The Calibration screen is where all the action takes place. Place the Spyder on the screen template and press the Next button to start the calibration process. A series of colour patches are displayed on screen and each is measured in turn.
The calibration process will stop at the Brightness control (Backlight) and prompt you to match the target value that was set in the previous screen. My target was set to 180 cd/m^2 and the value with the current reading is 99.0 cd/m^2. I now have to increase the brightness of my display to within 4% of the value. This involves using the monitors brightness control and increasing the screens brightness. Once it has been increased you will have to press the update button to refresh the reading, Repeat this process until the value is within the 4%. Press the continue button to finish taking readings.
Once completed you will be prompted to remove the Spyder and save you profile. You can use any name you like, I have a two monitor setup and have named my profile as Monitor 1, I will repeat the entire process on the second monitor and name this Monitor 2. There is also a calibration reminder which can be set from 1 day through to 6 months. A screen jumps up at the set day and reminds you to recalibrate your display(s). Generally most LCD screens are very stable and can be re-calibrated either every two weeks or once a month.