An average suburban household can reduce its electricity usage by at least 15 percent by installing LEDs and switching off lights in unoccupied rooms. File picture: Cottonbro Studio, Pexels
IF YOU want to cut down your electricity costs, you don’t need to start with solar panels or a gas stove – simply changing your lighting will make a big difference.
It’s all about energy efficiency.
“By changing your behaviour and your equipment, you can manage electricity demand in your home and, as a result, reduce your electricity bill,” says Dr Karen Surridge of the South African National Energy Development Institute (SANEDI).
In the energy industry, this is called ‘demand side management’, and, simply explained, it is when enough consumers – households, businesses, and industries – manage their demand, making a significant impact on supporting the electricity grid.
But even if your neighbours don’t come to the demand side management party, your household on its own can benefit greatly from adopting energy habits that are more efficient. And, when it comes to these energy efficient measures, lighting often doesn’t get the attention it deserves, she says.
“While it usually gets mentioned in the list of things people can do, we tend to focus on the more ‘exciting’ technologies, such as solar geysers or solar panels. Lighting, however, punches far above its weight when one considers the impact it makes.”
As with all energy efficiency measures, there are two components to managing your lighting, namely the technology and your behaviour.
“Behaviour starts with the decision to live a more energy efficient life. That commitment then plays out in switching off lights in rooms that are not in use and changing the settings on outside lights to only come on automatically when their sensors pick up movement at night and not when it gets dark. You can save without spending any money by simply using lights only when you need them.”
The second component is the equipment you use in your home.
Again, Surridge says, it couldn’t be simpler: swapping your incandescent or fluorescent lights for LEDs will change the quality and quantity of light in your home and save you money.
Powering two bedside lamps with 60W incandescent light bulbs is enough to light up your entire house if you invest in LEDs. In addition, you not only get clearer, better quality light, but LEDs last up to 50,000 hours equating to 17 years at eight hours a day. This is compared to the 1,000 hour lifespan of an average incandescent light, giving a mere four months at eight hours a day of use.
Ultimately, one 60W incandescent light bulb uses the same amount of electricity as 12 LEDs of 5W each but provides far less light, Surridge explains. And given how bright a 5W LED is, you won’t need 12 to do the work of one incandescent bulb.
Another noteworthy advantage of LEDs is that they can run on direct current (DC), which means you can use a battery to power them.
“People living in informal settlements or who don’t have grid electricity don’t have to make do with a bare, dim light bulb hanging from the ceiling and barely lighting up the room. They can replace it with an LED and get much better light for far less electricity.”
LEDs also don’t get hot like incandescent lights do, making them far safer for children.
Furthermore, Surridge says incandescent light bulbs generate more heat than light, which is what makes them so inefficient. Thus, the business case for households “is clear” when it comes to energy efficient lighting.
“Savings obviously differ depending on the size of your home and the number of lights you have, but an average suburban household can reduce its electricity usage by at least 15 percent by installing LEDs and switching off lights in (unoccupied) rooms. As a spin-off, when enough of us reduce our electricity demand, load shedding will become less severe.”