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2 Watt Led Replacement?

Discussion in 'LEDs and Optoelectronics' started by Wayno, Oct 14, 2016.

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  1. Wayno

    Wayno

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    Oct 14, 2016
    Not sure what I can do but this is what I want to do!

    I have an vent hood for my stove that has two 2 watt LED lights that shine down on the stove top. It's a nice vent hood but the LEDs are not near bright enough for my old eyes.

    I use halogens around the rest of my Kitchen and would like to replace the LEDs with some halogens. The size of the LEDs are exactly a swap for some halogens that I have, so the mounting is a 5 minute job.

    I want to use 12V 20 watt halogens. I have good access to 120v power source and I have step down transformer to power lights.

    So the problem is I want to use the nice little electronic panel that turns the LEDs on to switch on my halogens. I would think some type of relay could make this happen so that when the LED power turned on, the relay would active the higher voltage that would power the lights.

    Any ideas oh what it would take to make this happen?

    Thanks!
     
  2. KTW

    KTW

    273
    15
    Feb 22, 2015
    What's the voltage supply for the led's?
     
  3. Wayno

    Wayno

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    Oct 14, 2016
    It looks like 12 v but 2 watts - if that makes sense -

    Thanks!
     
  4. KTW

    KTW

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    15
    Feb 22, 2015
    That's a difference of 1 amp between the 2 watt and 20 watt.
    How many amps is the output on the step down?
     
  5. Wayno

    Wayno

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    Oct 14, 2016
    Well - not completely sure on how to read an amp draw multi-meter but put the meter inline between the red wire to the light and set it on 100 DCmA setting - I added a picture with results from my meter - does that help?
    MeterResults.jpg
     
  6. KTW

    KTW

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    Feb 22, 2015
    I know what the amps are that are being used but what I don't know is how many amps your step down is rated for.
    2, 20 watt bulbs will draw 1.7 x 2 = 3.4 amps.
    Is the step down output listed on the case, wattage or amperage?
     
    Last edited: Oct 16, 2016
  7. KTW

    KTW

    273
    15
    Feb 22, 2015
  8. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    The safest option would be to use slightly higher wattage LED bulbs. They will use a small fraction of the current a conventional bulb will. Try a 5W LED bulb. They are pretty cheap and will be a lot brighter.
     
  9. Wayno

    Wayno

    4
    0
    Oct 14, 2016
    Many thanks for all the help folks! Due to time constraints I ended up putting in an another switch and everything came out fine. But as always, I learned a little more!
     
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