The amount of day-light affecting lay is a generalization. Through the years, people selected birds for various traits (gameness, eggs, meat, dual-purpose). They also made selections based on the time of year laying occurred. For example, Cubalayas are excellent winter layers, but nothernern breeders do not care for this trait because of frozen hatching eggs; thus, they began to select hens that laid later each year until it is now possible to obtain Cubalaya strains that seldom lay in the winter.
Back to winter layers. I am most familiar with Orientals. The best winter layers I have raised are Asil; followed by Cubalayas and Shamos. The worse layers I know of in the Oriental class are the Malgache which only lay around 40 eggs per annum.
Most winter layers will take a break 2 weeks before Winter Solstice until 2 weeks after the Solstice then begin again. Also, understand that there are variations among strains of each breed.
By utilizing the wisdom of the past there is NO REASON FOR LIGHTS! saladin