Lighting. Saturday , September 22nd , 2018 - 02:24:37 AM
LED illuminates any outdoor spaces in unparalleled way with its enhancing visible appearance. Roadways and parking structure are now using LED lights to appeal its visibility and security. Cities are upgrading to LED Street light to improve light quality and efficiency. Parks, hotels, airport, and railway station are switching to LEDs for better light performance, security and to reduce maintenance expenses.
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.
This makes it a perfect alternative to a 120-volt system that must be installed by an electrician or lighting technician. Solar lights do not require the use of external cables and transformers because they are powered by the energy of the sun. The sun's rays are collected by small solar cell panels attached to the lights, which is converted into electricity and stored in batteries to power the fixtures at night. It is a self-generating power supply, which enable the lights to be used in many areas where it would have otherwise been too expensive or impractical.
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