Published at Wednesday, March 07th, 2018 - 11:44:29 AM. Bathroom Lighting. By Muriel Sylvestre.
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For effective bath lighting of any sort, it’s smart to pay attention to the CRI (color rendering index). A number of 100 is ideal but hard to find. Anything over 80 will allow people to see colors fairly accurately. Finally, don’t forget to specify the color temperature, expressed in degrees Kelvin (K). A 2,700K lamp is about the same warm yellow light as an incandescent bulb, and many clients prefer them. Jumping up to a 3,000K lamp makes a whiter light, still warm, that’s a good compromise. For residential use, 3,500K is about as cool a color as I’d recommend—it’s particularly good in closets, where you need accuracy for color matching when choosing clothing. Many clothing stores use 3,500K lighting for that reason.
A crisp white light tends to render skin tones most accurately. Halogen bulbs set the gold standard. Low-voltage varieties (with a built-in transformer that converts 120 volts to 12 volts) are especially compact, and the smaller bulb gives a nice sparkling effect. Halogen bulbs cost a few dollars more than standard incandescents but can last three times as long. Many feature screw-in bases; those labeled medium-base (MB) are shaped like standard incandescents, so they fit most fixtures. The newest compact fluorescent bulbs also offer good color rendering and are up to 10 times more efficient than regular incandescent bulbs.
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