Light from a skylight can be harsh, creating a spotlight effect and bringing as much heat into the house as light. Skylights also often require structural alterations to roof framing, and structural changes are never cheap. Instead of a skylight, consider a tubular daylighting device, shown here in cross section. Like Kalwall panels, the device fills a room with diffuse natural light. Though a 5,000- to 6,000-Kelvin bulb will supposedly reproduce natural light, there's nothing like the real thing. Even though the new bulbs out there use a lot less power than those Edison bulbs, there's no beating free light.More:How to Match Color in Photos to Real LifeGet Your Light Right for a Healthy House