Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Led lighting

  1. Oct 3, 2009 #1
    I put LED LIGHTS 60 WATTS on an off road vehicle with a stator not an alternator. When i use my winch or the cooling fan comes on the light goes out. I can turn the light switch off then on and it comes back on. It only happens when there is a fairly heavy draw on the system. Can this be fixed by a battery with a higher cranking amps.
    Last edited: Oct 3, 2009
  2. jcsd
  3. Oct 3, 2009 #2


    User Avatar
    Science Advisor

    Not sure what is happening here.

    I can picture the light going out briefly when the winch starts. These have a high starting current. But it should just come back on once the winch is turning.
    A cooling fan doesn't really draw much current, so that shouldn't be doing it at all.

    Maybe you have corroded battery contacts?

    What happens to the headlights if you turn the winch on? Do they drop a lot in brightness?

    Does the car start OK? That is the heaviest load for your battery so a bad battery or corroded contacts will usually cause trouble when starting.
  4. Oct 3, 2009 #3
    If the winch and fan are running i can turn light on an it stays on. If the light is on first it goes out . It is on a relay from the switch. Vehiclr is brand new
  5. Oct 3, 2009 #4


    User Avatar
    Science Advisor

    Relay problem.

    Maybe the relay is very sensitive about getting at least 12 volts?

    Try to listen to or watch the relay and see if it is dropping out.
  6. Oct 3, 2009 #5
    Ok thanks
  7. Oct 3, 2009 #6
    It sounds like the LED light manufacturer did a poor job. Vehicular electrical systems fluctuate greatly, and the vendor has a responsibility to validate their product prior to putting it on the market.

    I'd return to the store and attempt to get it exchanged for something of similar value.

  8. Oct 4, 2009 #7
    Light is a vision x xmitter . For the price it should be flawless.12"/20 led's $400
  9. Oct 4, 2009 #8


    User Avatar
    Science Advisor

    It may still be Ok. Could be a faulty installation.

    Try to measure the coil voltage at the relay when you operate the winch.

    Try to listen to or watch the relay and see if it is dropping out. It probably makes quite a loud "click" noise when it turns on or turns off.
  10. Dec 18, 2009 #9
    LED lights are far more efficient than any other lighting alternative commercially available at the moment. LED bulbs have a 100,000 hour lifespan, and will last for 11 years at continuous operation, or 22 years at 50% operation. Compare this to the approximate lifespan of 5,000 hours for an incandescent light bulb and 10,000 hours for a fluorescent light. Many businesses find the lifespan of LED light bulbs very attractive - imagine only have to change the signage on a business property once every 11 years. With incandescent and fluorescent bulbs, the true cost of the bulb should include the labor expense and time needed to replace them. LED lights virtually eliminate lighting maintenance costs.

    Last edited by a moderator: Apr 24, 2017
  11. Dec 18, 2009 #10
    Last edited by a moderator: Apr 24, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook