Solar Algarve offers led lightning only on project bases.If you want to replace all your lights in your house,garden,office let us know and we will advice you to make the right choices.
How they work
The LED consists of a diode chip made of semi conducting material, encased within an epoxy, plastic, resin or ceramic housing and attached to the electrical circuit. This housing may be in a variety of shapes and sizes and helps determine the optical characteristics of the LED. Generally a second optical controller is used in the form of a lens mounted on the epoxy housing.
As well as the optical control of the system, designing using LEDs requires careful thermal management.
Whilst the ratio of light to heat produced by LEDs is much higher than for an incandescent lamp they do still produce heat, not as infrared radiation (IR) – the light beam is cool – but conducted through the back of the chip.
Without adequate heat sinking or active cooling, the junction temperature of the internal diode will rise, shortening lifetimes. Finally, to operate LEDs requires a regulated direct current supply, usually supplied by a self-contained “driver” which converts the AC mains electricity to the correct DC voltage. This driver must be correctly matched to the LED it is powering as incorrect voltage and current will at best provide poor light, and may severely reduce the life of the LED or cause instantaneous failure of the system.
The driver can provide a quite advanced level of control, allowing dimming down to 0%, and with a cluster of different coloured diodes and the use of technology such as DMX protocols linked to a light mixing console extremely complex lighting effects may be produced.
What is the quality of the white light?
The colour-rendering index (CRI) is a measure of the ability of the lighting source to reveal the colours of an object. Higher numbers are better, up to a maximum of 100. Current LEDs used for interior lighting have CRIs around 90+.
What is the lifetime of a LED?
A benefit of LED technology is the relatively long life of the systems, manufacturers quote upwards of 50,000 hours life with 70-80% lumen maintenance, but other factors should be considered. Whilst an LED may produce light for a long period the amount produced will deteriorate over time rather than suddenly “burn out”. This is mainly due to discoloration of the epoxy housing of the LED over time.
Lumen depreciation and LED life varies between manufacturers, depending on how the LED is integrated, its operating temperature and the drive current, so makers data should be consulted.