1. What are LEDs?LEDs are light emitting diodes, semiconductor devices that convert electricity into light. These are electronic components that produce light by conversion of electrical energy directly to light by the movement of electrons within the material of the diode. Due to their efficiency and low energy, they are beginning to replace most conventional light sources.
2. Why do LEDs cost more than conventional light sources?LEDs are made of electronic components that are packaged together to offer long-lasting efficient light sources to the end user. Apart from the LED chip itself which has sapphire and gallium in the semiconductor, the process of packaging with materials like ceramic, rare earth phosphors, silicone, solder and gold wire add to the overall cost. White LEDs require further tests for calibration and standardisation. That's why it usually cost more than conventional light sources.
3. What are the economic advantages of using LEDs over conventional light sources?Although the initial cost of conventional light sources is less than LEDs, they do not take into account the operational and maintenance cost of the lighting system. LEDs, having a longer service life, reduce maintenance and lamp replacement cost. This reduces cost of labor to replace lamps and the cost of new lamps at the end of lamp life cycle. LEDs, also consume less energy. Thus the overall cost of a LED system can be significantly lower than conventional lighting systems. Most applications with LEDs offer a payback period as low as 3-4 years.
Check 4 Main Benefits & Advantages of LED Lighting for more information.
4. What's E27?E series LED lights usually refer to incandescent lamp with screw base. The figure "27" means the diameter of the screw base is 27mm.
5. What's MR16 stands for?MR16 is the specification of LED lamp cup which is also referred as the lamp housing of LED spotlight. "MR" stands for "Multifacedted Reflector", and the number "16" refers to lamp diameter, a multiple of unit length. 8 unit lengths equal to 1 inch. Thus, MR16 stands for 16 unit length(2 inches, or 5.08cm). The lamp diameter therefore is about 5cm.
6. What's GU10?GU10 is a different concept from MR16. It's related to lamp holder. Many people could not tell the difference between them. "GU" refers to cylindrical contact, and "10" is the distance, 10mm, between the two contacts. In addition, the most common lamp holders could be G5.3, or E27 which are inserted pin holder and screw holder respectively. The figures refer to the distance between the two pins and the diameter of screw holder. (Note: Many people could not distinguish G5.3 from GU10. Generally, GU10 is more usually in use in Europe. The power supply should be from 230V to 240V AC.
7. What dose PAR30 refer to?The most popular PAR lamps could be PAR30, PAR36, PAR46, and PAR56. Their sizes differ from one another. PAR lamp usually refers to downlight which is widely used for stage illumination and color-lighting effect. It's very common for stage application. PAR30 and PAR38 are different in diameter; they're applicable to different lamp bases.
8. Can I use LEDs in a green house?Yes, You can. LEDs can produce concentrated beams of light at specific frequencies of light. While sunlight comprises of the entire spectrum of light; LEDs can be designed to emit specific parts of the light spectrum that activate certain photoreceptors in the plant. For example, blue light promotes phototropism and cryptochromes which help germination and elongation of the plant, while red light stimulates phytochromes which help the plant to flower at the optimum time. Regulation of the spectrum of light based on the plants life cycle promotes faster growth and a stronger plant than the outcome under sunlight conditions.
Note that the light output of LEDs reduces at higher temperatures. You should make sure that the luminaire is suitable for the environmental consitions.
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9. Is it true that LED lights do not attract insects?LEDs do not have UV content and hence do not attract so many insects compared to conventional light sources.
Most insects are primarily attracted to Ultra-violet rays to help them forage, navigate and select mates. For example Indian moths are attracted to UV-365nm and green light-500nm.
Check LED lighting for more LED information.