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    I want to convert intensity of light showing on a seven-segment display to candela (unit of intensity of light.) Is there any calculation for it?

    Question #77781. Asked by rajamurtaza. (Mar 25 07 2:33 AM)


    toughynutter

    		intensity of led varries considerable based on a multitude of factor if you happen to know all of them then yes otherwise no.

    "Luminous flux refers to the
    total light available from an LED and it is measured in
    lumens (lm). This amount varies according to the
    LED’s color, and depends on the current density the
    LED die can manage. Package properties also limit
    the electrical current that can be safely driven through
    LED assemblies. The more current an LED device
    can handle, the more luminous flux it will produce. At
    this time, small-signal white LEDs can produce
    approximately 2-4 lm in a 5-mm package when driven
    at 20-30 mA. Power-packaged white LEDs can produce
    25-120 lm when driven at 350-1000 mA."

    http://www.nema.org/prod/lighting/solid/upload/IES-LED-Doc-TM16.pdf

    Mar 25 07, 3:40 AM
    toughynutter

    		Not all seven segment display are LED some are LCD which of course makes a difference as well

    "LCD do not produce light themselves but selectively block light from source behind the display
    "LCD crystals do not produce their own light, so an external light source, such as florescent bulb is needed for the image created by the LCD..."

    http://www.buyersedge.com/BuyingGuide/lcddirect/lcdd_guide.asp

    Mar 25 07, 3:51 AM

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