This video on YouTube shows the difference in lighting between summer and winter in the far North. The video consists of two synced time lapse sequences shot by regular webcam. One sequence taken during the darkest polar night and the other during the brightest summer.
Video was shot in Helsinki, capital in the south of Finland, so this doesn’t show how the midsummer sun stays in sight all night in Lapland. But still, the difference between summer lighting is quite remarkable compared to winter.