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led 12v mr16 traffo

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  • 05-10-2010 10:11pm
    #1
    grousedogtom
    Registered Users Posts: 463 ✭✭


    Just quick question
    3 watt led 12v mr 16 bulbs , is there a certain transformer to use or how many or how little bulbs per transformer?


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    #2
    Buford T Justice
    Registered Users Posts: 6,259 ✭✭✭Buford T Justice


    It would depend on the load rating of the transformer


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    #3
    grousedogtom
    Registered Users Posts: 463 ✭✭grousedogtom


    traffo is 20/60 w rated i wired 8 of them on the one traffo = 3 watt by 8 = 24watt they worked but flickered for half hour and then traffo failed , so i need a specific driver for 12v led gu10s?


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    #4
    Davy
    Registered Users Posts: 19,340 CMod ✭✭✭✭Davy


    grousedogtom wrote: »
    traffo is 20/60 w rated i wired 8 of them on the one traffo = 3 watt by 8 = 24watt they worked but flickered for half hour and then traffo failed , so i need a specific driver for 12v led gu10s?

    They will work with some transformers, but the driver is better for 12v ones.


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    #5
    Lamps and Lighting
    Registered Users Posts: 12 ✭Lamps and Lighting


    Hi Grousedog,


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    #6
    Lamps and Lighting
    Registered Users Posts: 12 ✭Lamps and Lighting


    Grousedog,

    Replacement led lamps do nto require a driver. drivers are for professional led products.

    Msot of the repalcement led lamps rated at 12v are designed to work on standard electronic transformers. However some may require the old wire wound transformers, very hard to get now.

    Try a new transformer if that fails source a dedicated led downlighter.

    Paul


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    #7
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    afaik these mr16 leds have a rectifier

    you just parallel them up- to meet the electronic trafos minimum load

    don't know much as i stick with the gu10 for simplicity


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    #8
    Lamps and Lighting
    Registered Users Posts: 12 ✭Lamps and Lighting


    There is another reason why they did not work on a electronic transformer.

    YOu need to meet the minimum load on the transformer, which is normally 20W.

    Paul


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    #9
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    well having 8 x 3 watt leds on the 20 watt transformer does`t seem like it would work for long.


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    #10
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    robbie7730 wrote: »
    well having 8 x 3 watt leds on the 20 watt transformer does`t seem like it would work for long.

    60va trafo

    20va minimum load i'm assuming here

    so he should be above minimum load

    you can always stick a 20w halogen on for test purposes to bring the load up


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    #11
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    M cebee wrote: »
    60va trafo

    20va minimum load i'm assuming here

    O yea your right, i see the 20/60 bit now, dont know what i was looking at, it needs the 20watt load to operate the traffo, maybe the 8 lights did`t quite make 20 watts then even theough they are supposed to be 3 watts each, or was just too close to the minimum.


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    #12
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    trafo may not have failed they usually have overload/SC protection and thermal even

    prob no output voltage showing without 20watt load


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