Opt for CFLs or LED lamps Compact fluorescent lamps (CFLs) are just as bright but consume less energy than incandescent light bulbs. They also emit less heat, so your air-conditioner can function more efficiently and doesn’t have to work as hard to cool the room. For longer-lasting lamps, choose LED lights, which last at least 20 times longer than incandescent bulbs.
$200 (based on using 10 CFLs) Make use of natural light Light-coloured, loose weave curtains let more daylight in as opposed to heavy, opaque ones. Place tables and chairs near windows where there is natural light, and use lighter colours in your rooms as they reflect light. A home with dark walls and curtains would require more artificial lighting and light fix fixtures to illuminate it adequately.
$91 (based on using natural instead of artificial light in three rooms for five hoursho a day)