Pendant light to downlighters

Discussion in 'Electrics UK' started by jon3674, 28 Jun 2007.

  1. jon3674

    Joined:
    22 Mar 2007
    Messages:
    54
    Thanks Received:
    0
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    I am planning to change my lounge pendant light for 6 downlighters, the downlighters in question are 6 x 50w 12v each with it's own transformer all are prewired so i hope will make the changeover easier. The current lighting circuit is 1.0m t&e, would this wire be suitable for the 6 downlighters?

    Thanks
     
  2. Taylortwocities

    Joined:
    28 Jul 2006
    Messages:
    13,677
    Thanks Received:
    1,212
    Location:
    Oxfordshire
    Country:
    United Kingdom
    Loading will depend on what else is on the lighting circuit!


    In design a light fitting is calculated as 100W so you are adding another 200W to the max load.
    It should be OK assuming no larger than normal loads.
     
  3. Steve

    Joined:
    15 Apr 2005
    Messages:
    16,004
    Thanks Received:
    226
    Location:
    Yorkshire
    Country:
    United Kingdom
    http://wiki.diynot.com/electrics:lighting:lamps:gu10

    Use 230 volt lamps and fittings. Then you can use CFL lamps if you so desire in future, when normal halogen bulbs are banned for their inefficiency and bad lighting.

    Also bear in mind 12 volt lamps use NO LESS electricity than 230 volt lamps. A watt is a watt, wattever the voltage. ;)
     
  4. chris_1982

    Joined:
    27 Jun 2007
    Messages:
    25
    Thanks Received:
    0
    Location:
    Wiltshire
    Country:
    United Kingdom
    P=IxV

    I=V/P

    so wouldnt it use less current? :confused: I've never bothered thinking about it.
     
  5. chris_1982

    Joined:
    27 Jun 2007
    Messages:
    25
    Thanks Received:
    0
    Location:
    Wiltshire
    Country:
    United Kingdom
    they are the same..

    "The fact is that the voltage does not matter, just because a lamp runs on 12 volts does not mean it uses less energy than a normal filament bulb.
    It is the Wattage that counts and only the wattage."

    source - ah lost the page lol.
     
  6. davy_owen_88

    Joined:
    17 Nov 2006
    Messages:
    1,680
    Thanks Received:
    2
    Location:
    West Glamorgan
    Country:
    United Kingdom
    If you have a 50w lamp at 12V it will draw more current than a 50w lamp at 230V. But since power is a combination of voltage and current they still use the same amount of electricity.
     
  7. Ratter

    Joined:
    13 Sep 2006
    Messages:
    97
    Thanks Received:
    0
    Location:
    Cheshire
    Country:
    United Kingdom
    This isn't quite true because the transformer also consumes power - i.e. wattage out doesn't quite equal wattage in. So actually they use slightly more.

    If you feel the transformer body when the lamps are in use, it will be warm because the lost power is converted into heat.

    A further complication is that not all lamps emit the same amount of light for a given wattage - e.g. more light per watt for a fluorescent source which is why they are considered to be greener.
     
  8. Taylortwocities

    Joined:
    28 Jul 2006
    Messages:
    13,677
    Thanks Received:
    1,212
    Location:
    Oxfordshire
    Country:
    United Kingdom
    That's true for traditional wire-wound transformers. there's iron losses and copper losses.
    Most transformers used in 12v lighting use mostly electronics to transform from 230 to 12v and there is very little loss so, for the purposes of this (DIY) thread, they can be ignored.
     
  9. chris_1982

    Joined:
    27 Jun 2007
    Messages:
    25
    Thanks Received:
    0
    Location:
    Wiltshire
    Country:
    United Kingdom
    so which is better out of mains voltage DL's or LV DL's?
     
  10. Steve

    Joined:
    15 Apr 2005
    Messages:
    16,004
    Thanks Received:
    226
    Location:
    Yorkshire
    Country:
    United Kingdom
    low voltage apparently give a nicer light to the trained eye but CFL energy savers are not available in 12 volt.

    mains voltage are easier to install and energy saving lamps are becoming more widely available. Therefore mains voltage is likely to be specified more in future as filament lamps are outlawed in the next few years.
     
  11. securespark

    Joined:
    11 Jan 2004
    Messages:
    25,793
    Thanks Received:
    484
    Location:
    Cheshire
    Country:
    United Kingdom
    Plus, there's less maintenance with LV downlighters because there's no tranny.
     

Share This Page