Thread: LED spot lights

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    LED spot lights
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    gthorpe2
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    Default LED spot lights – 02-10-2010,01:55 PM


    I've been doing some searching and I found a website for LED spot lights. I'm going with a 10mm LED with a 270ohm resistor, and the power supply is a 9v battery. I soldered everything together, but the light is not as bright as I want it.

    My questions...

    What would make the light bright?

    Any other suggestions?
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    Calloween
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    Default 02-10-2010,02:28 PM
    change the resistor.
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    Default 02-10-2010,02:31 PM
    what color is the led?
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    Default 02-10-2010,02:44 PM
    The LED should have come with some information as to how much current and at what voltage it will run optimally at. If you subtract that voltage from 9 (your supply voltage) and then divide that value by the rated current the result will be the size of resistor you will need for your LED to operated at its brightest safe level. This is based on Ohms law. PM me if you have any questions and I will be happy to help. Keith
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    Default 02-10-2010,02:59 PM
    for blue leds use 220 ohms.
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    gthorpe2
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    Default 02-10-2010,03:18 PM
    This is what's on the back off the LED package...

    Intesity: 400 mcd (typical)
    Wavelength: 660nm (typical)
    Viewing angle: 16 degrees
    FW current: 20mA
    FW supply: 2.4 V (max)

    BTW it's a red LED
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    Default 02-11-2010,04:19 PM
    LED calculator for single LEDs


    330 Ohm would be ideal for that LED.
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    gthorpe2
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    Default 02-11-2010,08:05 PM
    Got a higher mcd light and should work now!!
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