When is it profitable to switch off the lights?

From the perspective of saving energy, it is best to switch them off whenever it is possible. The energy used for switching the light on does not greatly differ from the energy used for the lamp being on. The light going on it can be described as warming up. Energy saving lamps can even take 2 minutes to reach 60% of their full brightness.

The operating lifetime of regular lamps, halogen lamps, and LED lamps does not decrease from repetitively switching them on and off. However, the lifetime of energy saving lamps and fluorescent lamps does decrease. The decrease is very little that it does not have an effect on the energy consumption. Economically thinking, switching off the lights is profitable if the room is vacant for at least 15 minutes.

What lamp consumes the least energy?

Natural light should be used in addition to artificial lighting whenever it is possible. When considering energy efficiency, Led lamps and fluorescent lamps are practically the same, whereas halogen lamps consume approximately 3-5 times more energy. The lifetime of LED lamps is approximately 30000-50000 hours and of fluorescent lamps it is approximately 8000-20000 hours. Halogen lamps are the last coming in at approximately 2000-3000 hours.

When choosing your lighting, it is important to consider many aspects, not only that of energy efficiency. Warm spaces, such as the sauna must be equipped with halogen lamps, due to LED and fluorescent lamps being unsuitable. Also, the need for dimming lamps needs to be considered, due to halogen lamps being the only dimming lamps; LED and fluorescent lamps have dimming as an extra feature. When considering the lifecycle cost of a lamp, fluorescent lamps are still the more efficient choice compared to LED lamps. If you appreciate a nice ambiance and quick starting time, LED lamps are the better option for you.

Which lamp would best replace a 60W regular bulb?

The amount of light produced by a 60W bulb is equivalent to an energy saving lamp with a luminous flux of 700 lumens. The power of energy saving lamps varies from 127-1900 lumens and the consumption of energy is 4-30 watts. A regular 60W bulb is equivalent to an 11W (710 lumens) energy saving bulb. Differences may occur between brands. According to an EU-directive, all producers must state the same information about bulbs on the packaging.


How can I avoid light pollution?

Light pollution can be considered, for example as artificial outdoor lighting which causes harm to the nature, human comfort and human health. Light pollution can be reduced by, for example using lights equipped with motion detectors. Having motion detectors ensures that the lights are used only when needed. In addition, dimmer lights or dimmers for lights can be used to reduce the amount of light emitted. Also, a dimmer light is safer for the eyes if the yard is very dark. It is also a better option when considering neighbours and wildlife. Light escaping from inside can be avoided by using curtains or blinds.