For providing more shelter, that makes sense.
Regarding natural light and the effect on egg laying, it can vary by the season (less in winter, more in summer), the weather (cloudy days are darker), landscaping (shaded by trees or not), by housing method (a tight warm coop is sometimes dark, unless the person specifically plans for windows or lights), and by other things as well. It also seems that some hens need more light than others to lay eggs, so a mixed-breed flock will often have some that lay earlier in the spring or later in the fall than others do. All of that is why I suggested they might start laying anytime between January and April