Incandescent bulbs create light by passing electricity through a metal filament until it becomes so hot that it glows. Incandescent bulbs release 90% of their energy as heat.
Halogen lamps as opposed to common bulbs are filled with halogen. They give substantially more light, up to 100% more than a regular bulb. They also save 30% on electricity, reduce carbon dioxide emissions by 30% and have twice the operating life of a regular bulb.
Energy saving bulbs and compact fluorescents
In a CFL, an electric current is driven through a tube containing gases. This reaction produces ultraviolet light that gets transformed into visible light by the fluorescent coating (called phosphor) on the inside of the tube. A CFL releases about 80% of its energy as heat. Energy saving bulbs and compact fluorescents use 80% less energy than a regular bulb and last up to 15 times longer. It remains eco-friendly throughout its entire lifecycle thanks to reduced energy consumption and waste production.
Energy saving bulbs contain a small amount of mercury and should therefore be properly disposed of at a recycling centre.
LED lighting products use light emitting diodes to produce light very efficiently. The movement of electrons through a semiconductor material illuminates the tiny light sources we call LEDs. A small amount of heat is released backwards, into a heat sink, in a well-designed product; LEDs are basically cool to the touch. LED stands for Light Emitting Diode. A LED is a semiconductor which produces light within a narrow spectrum.
LEDs have very low energy consumption, emit little heat and have an average lifetime of up to 50,000 hours. A LED can unlike other light sources, change colour.
Some useful lighting terms
Watts (W) are a measure of power consumption but give no information about the amount of light emitted by the light source. A 100 watt bulb and 20 watt energy saving bulb give off about the same amount of light, but consume different amounts of power.
Lumen (W) measures how much light a radiating light produces, but gives no information about energy consumption.
Candela (cd) discloses how much light from a directed light source with a certain dispersion angle reaches a defined point.
Lux is the most common measurement of light intensity and states the amount of luminous flux reaching a specific area from a light source.
Kelvin (K) elates to the colour temperature of the light. For example a common bulb has a colour temperature of 2700° Kelvin.
Colour temperature: Hue:
2700 K Incandescent light
3000 K Warm white
4000 K Cold white
6000 K Daylight
Energy efficiency rating for bulbs and fluorescent tubes
A = More efficient
G = Less efficient
Letter designations in text or figures indicate a bulb s energy efficiency rating on a scale from A to G
|25W = 3W LEDs||40W = 7W LEDs||75W = 10W LEDs||100W = 15W LEDs|
|20W = 2-3W LEDs||35W = 4W LEDs||50W = 7W LEDs|
|75W = 30W LEDs||150W = 60W LEDs||250W = 120W LEDs||400W = 180W LEDs|