Electrical Directory

FAQ: LED Lights

Q. Does turning a light on and off use more energy than leav...

Q. Does turning a light on and off use more energy than leaving it on?

No. Switching on an energy saving bulb only uses the same amount of power as leaving it on for a minute or two. Turning the bulb on and off repeatedly may shorten its life but normal household use shouldn't cause any problems.

Q. What are the standard comparisons used to evaluate the co...

Q. What are the standard comparisons used to evaluate the colour quality of light sources?

Colour Rendering Index - CRI indicates the accuracy with which a light source such as an LED can reveal the various colours of an object. The standard CRI system is based on eight colours across the spectrum.

Additional R-values of CRI are used to represent certain colours. The appropriate R-values are application specific. For example R9 represents red and is good for lighting for lighting flesh. It also tends to make the light Warmer.

Colour Quality Scale CQS is a new system that uses a wider palette of 15 reference colours as against the smaller palette of 8 reference colours used for the CRI system.

Q. Why LEDs are considered more efficient than conventional ...

Q. Why LEDs are considered more efficient than conventional light sources?

In many cases when comparing the lumen output between LEDs and conventional light sources, LEDs may have lower lumen value However LEDs are directional light sources. All the lumens emitted from an LED are directed towards the task area; while conventional sources emit light in all directions which are then modulated in a given direction with optical systems like reflectors and lenses. The proportion of lumens that falls in the task area from an LED light source is greater than that of a conventional light source.

Q. Is lifespan reduced if the LEDs are frequently turned on ...

Q. Is lifespan reduced if the LEDs are frequently turned on and off?

Unlike discharge lamps, LEDs are semiconductors and their life span is not affected by the number of times they are turned on and off.

Q. What are the factors that affect the lifespan of the LEDs...

Q. What are the factors that affect the lifespan of the LEDs?

The thermal management of the LEDs.  If LEDs come on a standalone chip, appropriate heat sinks have to be designed to prevent premature failure of LEDs.

The electrical stress: Running LEDs at currents higher than specified make the LED run hot. This can happen with wrongly matched drivers. E.g. the driver produces 700mA whereas the LED needs 350mA stresses the LEDs and reduces its lifespan.

Higher ambient temperatures than that for which the product is rated reduces the life of the LEDs.

Q. Is it true that LED lights do not attract insects?

Q. Is it true that LED lights do not attract insects?

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. LEDs do not have UV content and hence do not attract so many insects compared to conventional light sources.

Q.Is LED light a different type of light?

Q.Is LED light a different type of light?

Yes, LED light is said to be a safer, healthier light and power saver. LEDs do NOT produce any sort of ultraviolet radiation and contain no mercury making them environmental friendly. Residential and especially commercial and industrial plants, stores, libraries, galleries, and warehouses can immediately benefit from LED Lighting.

Q.Do LEDs produce noise when in use?

Q.Do LEDs produce noise when in use?

No.LEDs do not "buzz" when powered on or when dimmed, unlike some other lamps like fluorescent tube.

Q. Why should I pay more for LED lights than other lighting ...

Q. Why should I pay more for LED lights than other lighting options?

The LEDs have a very long life, do not need replacing, consume a fraction of the electricity of incandescent bulbs, and are not nearly as subject to voltage drop. A standard 60W incandescent produces 800 lumens, whereas LEDs consume 13-15 watts to produce 800 lumens. Payback is approximately two years of saving electricity bill and bulbs.

Q. what kind of parts are in LED bulb?

Q. what kind of parts are in LED bulb?

LED bulbs contain one or more LED chips mounted on a circuit board which is programmed to control the LED lighting system. It is mounted on a heat sink to absorb the heat generated from LED bulbs.

Q.Why LEDs are eco-friendly compare to incandescent, CFLs bu...

Q.Why LEDs are eco-friendly compare to incandescent, CFLs bulbs?

Because:

  • The life time of LED is about 10-20 Years and thus their disposal is less of a concern.
  • It does not contain any mercury, which is harmful for environment unlike the fluorescent bulbs and lights.

Fluorescent lights contain mercury which is harmful for environment and their disposal is a concern. And this is a problem with both fluorescent and CFLs tube lights.

Q.How the brightness of led lighting differ from incandescen...

Q.How the brightness of led lighting differ from incandescent bulb?

Led bulbs are brighter than incandescent bulbs and they are not available in very high wattages. Thus, when replacing incandescent bulbs with led lamps, more Led lamps are often needed. For example, to replace 100-watt incandescent bulb you may need two 6-watt led bulbs. Although you have more bulbs you are still using 85% less electricity.

Q.Comparison of LED, Incandescent, CFL lights?

Q.Comparison of LED, Incandescent, CFL lights?

 

LED Light

CFL Light

Incandescent bulb

COST (Rs.)

290/-

45/-

15/-

Wattage

10 watts

40watts

60watts

Life time period

50,000hours

10,000hours

1200hours

No of Bulbs

(Needed for 50,ooo hours use)

1

5

42

Power consumption/Year

(If we use 6 hours a day)

21.6kw

86.4kw

129.6kw

Electricity Bill

 (Rs.3 per KWH)

Rs 64.8/-

Rs 259.2/-

Rs 388.8/-

Q.Where have LEDs been used in the lighting industry?

Q.Where have LEDs been used in the lighting industry?

The use of LED luminaries in applications such as street lighting, area lighting, parking structures, security lighting, and even general lighting for interior spaces is viable today both economically and from an illumination performance standpoint.

Q.Is really LED lights does not emits UV or IR spectrums?

Q.Is really LED lights does not emits UV or IR spectrums?

Yes, unlike incandescent and fluorescent light sources, LED Lighting Products virtually not emits Ultraviolet (UV) or Infrared (IR) spectrums.

Q.Is an LED produce enough light to replace my present bulb?

Q.Is an LED produce enough light to replace my present bulb?

For most of the applications, yes. LED products are now reliably replacing incandescent equivalents of up to 100 watts which produces enough lighting.

Q.How to measure the quality of LED light?

Q.How to measure the quality of LED light?

Color Rendering Index (CRI) is generally used to measure light quality on a scale from 1-100. Most LEDs have a CRI rating of at least 80, and many are rated 90 and above.

Q.What is the rated life of LED lights?

Q.What is the rated life of LED lights?

Many LEDs have a rated life of up to 50,000 hours. This is approximately 50 times longer than a typical incandescent bulb, and 8-10 times longer than a typical CFL.

LED lighting can save up to 85 percent of the electricity used by incandescent bulbs and up to 50 percent of electricity used by fluorescents.

Q.What are the advantages of switching to LED lights?

Q.What are the advantages of switching to LED lights?

  • Consume very less power compare to other bulbs.
  • Extremely long life time period.
  • Produces little bit heat and do not emit UV or Infrared.
  • Resistant to Shock and vibration.
  • Does not contain Mercury. 

Q.What is the full form of LED?

Q.What is the full form of LED?

LED stands for Light Emitting Diode.

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