My Epson 2400 PHOTO flatbed scanner has a backlight which allows scanning of slides and film strips, positive or negative. I just reactivated it after a year of rest. The colors are good, though I'll grant you that the resolution won't compete with a high-end dedicated film scanner.
I was motivated the reactivate this scanner after trying out a US$99 USB film/slide scanner. The colors and handling of wide ranges of brightness by the USB scanner were unacceptable to me.