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Over the past 25 years, makers of skylights and roof windows have standardized their products so that most offer the same basic sizes and configurations. Glazing options have also become standardized — most skylights these days are glazed with argonfilled, low-e glass — so R-value is less of a distinguishing feature than it used to be. As the differences among brands have diminished, skylight manufacturers eager for more market share have expanded into specialty coatings and flashings, increasingly sophisticated remote-control devices, and accessories like hidden motors and high-efficiency hand cranks. The once time-consuming process of getting custom skylight sizes has given way to responsive companies offering one- or two-week turnaround for any size skylight. Let's