The Martian orbit is quite elliptical relative to Earth. Sunlight during the perihelion months is 40% brighter than at aphelion. Not from the angle of Sun, like we worry about with Earth seasons, but the actual size of the Sun in the sky. Furthermore, dust storms are significantly more common during the brighter months.
Assuming the energy on a Martian colony would come from solar panels, a Martian colony would still need to care significantly about the seasons and time of day.
