Lines on my light box scan
The vertical lines are a product of the frequency the bulbs in the light box "flash" on and off and the interval at witch the scanhead takes to make a capture (linetime). The dark underexposed line on the image is created when the bulb is not currently on for the fraction of a millisecond that the scanhead is capturing that particular line. The easiest solution is to slow the line time down as low as you can to allow the light to "flash" several times during the capture for that line. Otherwise I have found that the Hz of the lightbox bulb have a relationship with the linetimes at intervals of 60... so setting the linetime to 60, 120, 180, 240, etc. can help to lessen the problem.