Tubular skylights are an alternative for natural light

  • Tubular skylights fill a interior room or dark hallway with directed natural daylight instead of artificial light.

    Tubular skylights fill a interior room or dark hallway with directed natural daylight instead of artificial light. Daily Herald File Photo

Posted6/5/2021 7:00 AM

Q: As I have gotten older, I find I see better under natural light. Would installing a tubular skylight bring in much natural light without losing a lot of heat during winter?

A: A tubular skylight loses less heat than a traditional big skylight and is easier to install. It does penetrate the attic insulation envelope, but installing one can reduce your light costs. It is not uncommon for people to see better under natural light and natural light creates a nicer ambience indoors than switching on lamps.


Of the two basic skylight options, standard rectangular or tubular, a tubular one is more energy efficient. Since it creates a smaller hole in the insulated ceiling, less heat is lost during winter or gained during summer. Weatherstripping on the top and bottom eliminates air leakage.

The amount of light that comes in from a small tubular skylight is quite amazing. I installed a 10-inch diameter one in my garage. I can easily work on my car in there without any additional electric lights on. If there is a full moon at night, enough light comes through it so I can walk safely in there.

To get a rough idea of how much light output there is from a tubular skylight, figure on the equivalent brightness of three 100-watt incandescent light bulbs from a 10-inch diameter tube. A 14-inch diameter one provides about twice as much light.

A tubular skylight is pretty much like it sounds. It is a sheet metal tube that extends from a hole in the room ceiling up through the roof. The top is covered with a clear plastic dome and the bottom is covered by a clear light diffuser. It looks similar to a sealed recess light from indoors.

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The inside surface of the tube is highly reflective. The sunlight that enters the top dome reflects back and forth in the tube until it comes out the bottom diffuser. Because it is so highly reflective, very little brightness is lost. This allows it to catch light even when the sun is not directly overhead, but it is still wise to locate it in the sunniest spot.

To catch even more of the indirect light from the sun during morning and evening, select a tubular skylight with a prismatic top dome. This dome bends the indirect light rays so they come more directly down the tube into the house. All of the clear acrylic domes filter out the ultraviolet fading rays.

The light from the tubular skylight can become very bright, especially around noon. Optional internal remote-controlled dampers are available to reduce the light intensity. Also, an optional small light fixture can be mounted in the tube to provide light, similar to a recessed one, at night. For a bathroom application, a vent fan option is also available.

The following companies offer tubular skylight kits: ODL, (866) 635-4968, www.odl.com; Solatube, (888) 765-2882, www.solatube.com; Sun-Dome, (800) 596-8414, www.sun-dome.com; Tru-Lite, (520) 622-2152, www.tru-liteskylights.com; and Velux, (800) 888-3589, www.veluxusa.com.


Q: I am building a super-efficient smart house. I plan to install a direct-vent gas fireplace. It will be a unique tall design that is difficult to find. Is it difficult to build one myself?

A: A direct-vent fireplace is most efficient because the firebox is sealed from the room air. The proper amount of combustion air is needed for various fire levels, so it may be difficult to set up the controls for a do-it-yourself one.

A vent-free gas fireplace is also very efficient and simple to build because it is open. Because the fumes are not vented outdoors, its operating time is limited each day depending upon the size of the room.

• Write to James Dulley at 6906 Royalgreen Drive, Cincinnati, OH 45244 or visit dulley.com.

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