Lighting. Wednesday , September 19th , 2018 - 17:54:52 PM
Light quality and colour can dramatically change the appearance of a room so it is important to get this right. You wouldn't, for example, want bright white lighting in a bedroom, instead a soft warm white ambiance would be more suitable. When choosing a light bulb you first need to decide which colour temperature you require. Colour temperature is a measure of how warm or cool a colour appears. It is measured in Kelvin; the standard measurement for lighting output in addition to lumen output. Colour temperature is derived from the colour of light produced when carbon is heated. The Kelvin Scale ranges from extra warm white at 2,700k giving a warm yellow glow, to white at 3,500k, cool white at 4,000k and daylight colour at 6,500k which produces a white blue colour. LED, CFL and halogen energy savers are all available in a range of colour. Complaints have been made in the past about LED giving off a cool blue light but with the improvement in technology, as long as you buy a good quality LED this should not be a problem. It is then important to look at the colour rendering index (CRI) which shows to what extent the light will make an object appear its true colour. An incandescent bulb is rated at 100% because its light contains a full spectrum of colour. CFLs do not contain the full colour spectrum but a good quality triphosphor fluorescent rated between 80-90% will be sufficient for everyday use. Higher rated CFLs can be obtained but are usually only used by designers or artists and are less efficient. It is advisable not to buy a light bulb which scores below 80% on the CRI scale. Energy saving light bulbs have received a bad press at times because of the light they produce, but this has tended to be because many poor grade CFLs either brought from supermarkets or given out for free by energy companies have come onto the market.
General Lighting is used to illuminate an entire room, this can be accomplished with chandeliers, ceiling or wall mounted fixtures, recessed or track lights. You can double the amount of light if it is reflected on a mirror, a wall or white ceiling. Task lighting is used to illuminate a particular area. For non-dazzling light when working, hide it with some kind of screen, always trying to focus in avoiding shadows on the work area. It can be provided by recessed and track lighting, pendant lighting and under cabinet lighting, as well as by portable floor and desk lamps.
LEDs are nothing like an incandescent light bulb. They have no glass bulb, there is no filament, and there is very little heat produced. This is because LEDs produce light in a wholly different manner. Rather than heat a filament like an incandescent bulb to produce light, which is by the way extremely inefficient, LEDs produce light through a process called electroluminescence. Rather than go into a long and drawn out technical explanation, it's enough to simply say that electrical power is fed through a small piece of semi-conducting material which then emits light energy. This process is extremely efficient, produces little heat, and is basically solid stated in operation, meaning there are no parts to simply burn up or wear out in a short period of time. At the most basic level, an LED is a diode, just like you'd find in a radio or your computer. They're efficient, compact, and powerful light sources that can operate for several years without fail.
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