"NLIGHTS" – LED Lighting, a division of

 Xian Huan-tai Technology & Development Corp., LTD

Q:Why LED lights become increasingly more popular?

A: In comparison with tradition bulbs, LED lights have the following features:

  ·  Longer life span

  ·  Instant switch on

  ·  Higher color properties

  ·  No hazardous substance

  ·  Do not ‘burn out’

    Q:What is the life expectancy of LED lights?

    A: Subject to the design and environment, the life expectancy is in an approximate range of 25,000 to 50,000 hours. High temperature, humidity and current loads will speed up light depreciation.

    Q:How are LED light bulbs compared to Incandescent, Halogen and CFL bulbs on luminaries?

    A: The following table shows the typical comparison:

    Incandescent (Watt)

    Halogen (Watt)

    CFL (Watt)

    LED (Watt)





























    The above data may differ subject to LED chip and lumens.

    Q:How long can I get my investment on LED light payback from electrical bill?

    A: Subject to your local electricity rate and your usage, the investment may be returned sooner or later. Here is an simplified example: Assume that a 100W incandescent bulb is replaced by 15W LED bulbs working 8 hours every day for one year at electricity rate of USD0.13/KWH. (100W-15W) /1000 X 8h X 365d X USD0.13/KWh = USD32.266. Under such condition and environment, you could get the investment returns in one year.

    Q:What kind of light quality is expected for LED light?

    A: First, various color temperature for white led: the Warm white: 2,700-3,300 K, Neutral white: 3,500-4,500 K, Cold white: 4,500-10,000 K. Second, colorful LED including Red, Yellow, Blue, Green, Purple, Pink etc. provide infinite idea for lighting designers. Finally, high CRI (75~80) assure that original color of objects look true.

    Q:Terminology & Definition

    A: See table below:






    Correlated Color Temperature

    A measure of the color appearance of a white light source with Unit of Kelvin. Sunlight at sunrise is 1800K, 100W Incandescent light bulb is 2850K, Overcast Sky is 6500K.


    Color Rendering Index

    A measure of how a light source renders colors of object and is given as a number from 0 to 100.


    The intensity of the light.

    The higher the lumens, the brighter the light


    Amount of electrical energy consumed

    Lower the watts, the lower the energy consumed


    The efficiency of the bulb to convert electricity into light

    More efficient bulbs provide more light using less energy