Move over halogen bulbs, the new bulbs on the block are revolutionizing the world of outdoor lighting. LEDs, the light emitting diodes that illuminate our car break lights, alarm clocks, and our household electrical appliance, are exploding into our gardens.
LEDs are so energy efficient that the State of California promotes them for indoor and outdoor lighting. The State’s goal of lower energy use is intended to “reduce air pollution from the burning of fossil fuels in power plants while producing the same quality of light as traditional incandescent bulbs.”
Traditional outdoor lighting is low voltage. A cable connects a string of light fixtures to a transformer that converts household current to 12-volt direct current. LED systems use a driver rather than a transformer to regulate the electricity.
Outdoor LED systems like the ones on this page from Kichler, offer both opportunities and challenges. Experts agrees that silica based LEDs are shatter resistant, a definite plus for outdoors.
Cool temperatures are another plus. Incandescent bulbs generate light by heating a metal filament until it glows. Incandescent halogens can reach 500° F, according to electrical contractor and lighting design instructor Paul Bussell of Ladybug Lectric in Encinitas, California. Extreme temperatures singe leaves, branches, and fingertips. LEDs generate almost no heat, making them safe both in the landscape and to the touch.
While burnt-out bulbs are a common complaint for traditional outdoor lights, LED lifespans are estimated at about 10 years, though, Bussell points out, they’ve not been used in outdoor lighting that long. Only time will tell.
Bussell says that LED light quality is almost up to his standards. “Its hard to put one into an uplight and expect to dim it,” he says, “ and in a sequence of lights, they may not all be the same color. Some might be more blue or more yellow.”
Joe Bell, general manager Lightbulbs Unlimited in San Diego agrees that color is “people’s number one concern. We can get warm whites that look like (the color of) an incandescent bulb….you wouldn’t notice the difference.”
While Bell recommends a driver for new LED systems, he says that for retrofitted systems and those with both halogen and LED fixtures, simply use the existing transformer. Lightbulbs Unlimited also carries LED bulbs that fit into traditional halogen lighting fixtures, “You can retrofit what you have already… Still, you have to match the draw to the transformer.” And if you want to dim an LED, Bell says, use a dimmable driver.
Cost, of course, is a factor. At Lightbulbs Unlimited, a normal halogen uplight may cost $9, while an LED uplight might cost $25 to $45.
Despite the upfront cost, says Bussell “If you factor in usage, longevity and replacement, LED systems are a fifth the cost of halogen systems.”
“Its a huge difference,” Bussell continues, “That one factor alone is the quickest and most efficient way to cut energy use.”
The State of California maintains on-line database of products that meet state-mandated criteria for energy efficiency including LED bulbs. When you visit the database, select the category “Lighting Products,” and the type “High Efficacy LEDs.”