Copyright 2011 Edisonglobal | Website powered by Lucknowwebs.com
In recent years LEDs have been widely used in very specific applications. However, the technology is now mature and offers effective, competitive and highly advantageous solutions for general lighting applications. A wide range of LED Retrofit Lighting now exists, unfortunately the vast majority of the LED lamps available on the market are of poor construction, low light output and questionable life span.
Ideal's commercial range of LED products have been engineered for long life, using premium components and the brightest and robust LEDs available on the market. All our LED products have been certified and undergone rigorous testing to ensure they stand up to their claims.
There are lots of myths surrounding LEDs, which the industry needs to dispel. For example, fitting LEDs previously required lots of wiring and soldering, but now many retrofit bulbs offer ‘plug and play’ like functionality....you simply just swap out the bulb!
LED Lighting Facts
LEDs are highly efficient. New LED Retrofit bulbs typically consume only a few watts of power, resulting in massive savings in energy bills compared to their equivalents.
LEDs are projected to produce a long service life of between 10,000 and 50,000 hours. For this reason LEDs are ideal for hard-to-reach / maintain fixtures such as exit sign lighting and combined with its durability - pathway lighting.
Plug & Play Retrofit
Many LED bulbs are now available as a direct replacement for standard lighting, simply swap out the bulb and plug in the LED replacement.
Wide Range of Colors
LED bulbs are available in warm and cool white color temperatures. The majority of LED bulbs are also available in a wide range of colors, such as red, green, blue, yellow etc. LED effects lighting offers rich vibrant colors that are sure to impress.
No UV Emissions / Low Infrared / Low Heat
LEDs produce no UV radiation and relatively little heat, making them ideal for illuminating objects, such as works of art or perishable foot items that are sensitive to heat and UV light.
LEDs are very rugged. They feature no filament that can be damaged due to shock and vibrations.
Unlike compact fluorescents, LEDs do not contain mercury and hence can be more safely disposed of.
LEDs reach their full brightness almost instantly, unlike compact fluorescents which can take more than a minute to reach their maximum output.
LED retrofit bulbs are designed fit into existing fittings as they are almost identical in size and shape to the bulbs they replace.
As the next generation of lighting source, high power LEDs have a number of advantages such as power saving, efficiency and cold start. They are environment friendly and have a long life which reduces the cost of maintenance. It is reported in research that an LED lamp of 100W or so can reach the lighting intensity of a 250W high voltage sodium lamp, presenting significant power efficiency. LEDs require low voltage DC supply, necessitating conversion of the relatively high voltage AC mains. The power supply for LEDs should meet the following requirements:
1. PF >0.9;
2. Power Efficiency >85%;
3. Compliant with Energy Regulations;
4. Constant Current Output;
5. High Reliability;
6. Surge Protection;
7. Low Ripple;
8. Operation Temperature -40°C - +70°C
The requirements list above indicates that a typical LED street lighting solution will comprise the following modules - EMI filter, bridge-diode, PFC, isolated DC-DC converter, and LED constant current controller. Depending on the output power, PFC may operate in either Discontinuous Conduction (DCM),Continuous Conduction (CCM) or Critical Conduction (DRM) mode. Generally, PFC has a stable 400Vdc output to feed the isolated DC-DC converter when the input is within the range from 90V to 264V. The Isolated DC-DC converter can be either fly-back or LLC type. For the LED lamps higher than 100W, the design theory of using CCM PFC or CRM PFC and LLC isolated conversion is commonly adopted. LED constant current control can be implemented by buck, boost or buck-boost topology.
A LED street lamp consists of power supply, thermal dissipation system, and LED array. The environment in which LED street lamps will be operating should obviously be taken into consideration to ensure that adequate protection is provided.
It provides active power factor correction and driver the PFC MosFET
Know more about LED Lighting...