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How may spots???

Discussion in 'Home Cinema Building DIY' started by Les E, Oct 18, 2004.

  1. Les E

    Les E
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    My Home Cinema room will be around 11ft by 8ft and I am thinking of having dimmable halogen spots on the ceiling and maybe a couple of wall mounted uplighters for effect.

    I am also thinking of using the Lutron Telume to dim by remote, but I could really do with a bit of advice on how many halogen spots I should install in a room of this size?

    I was thinking of around 9 but i don't know if that's going be too much or too little.

    Any thoughts anyone? :confused:
     
  2. dj_johnnyg

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    Firstly I am assuming you plan to use 240V Halogens and not low voltage bulbs. Low voltage bulbs require very specialist dimmer switches.

    The next thing you need to look at is the Wattage handling of the dimmer switch.

    If the switch can handle 300W, then you will be limited to 6 x 50W bulbs (The most common one to find in hardware shops), 8 x 35W or 12 x 25W.

    I am currently using 7 x 50W bulbs in my lounge (15'x18'), but want to use a remote dimmer, so am going to drop the wattage of the bulbs to 35W, as the switch I've seen has a rating of 300W.

    One thing to take into account is that I find when I have all 7 Halogen bulbs on, I don't need to turn the central heating on, as it gets very warm in the room.


    If your going to be using the lights in a HC, then you should be able to get away with either the 25 or 35W bulbs, but be prepared to pay a bit extra for your bulbs on the highstreet.

    Hope that's some help
     
  3. cskates

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    I have 9 50W LV halogens in my approx 14ft x 14ft lounge, it's more than would be normally required for that size room (I usually have them dimmed at 70% of max). I have them split into two zones of 5 and 4 on a Lutron Grafik Eye so I can turn off the ones near where the screen will be and keep the seating lights on dim. 4 50W would probably be enough in your room, but more does allow you to be more creative and the excess light can be cut down since you're dimming them anyway.
    You can run LV lights off a Telume but just double check the transformer is compatible, it needs to be trailing edge IIRC. You may also find the transformers and dimmer will buzz when dimmed, though better transformers will fix this I'm told. 240V halogens are a lot cheaper to install and easier to dim since there's no need to buy transformers, but the bulb life is shorter, they're not as bright and the colour of the light is different.
     
  4. moviemike

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    My AV room is 11 x 14 foot and I've got 4 wall uplighters and 4 spots. was gonna get some more spots, but 1) I don't want them to interfere with the projected image and 2) wall uplighters give off lots of light (at least compared to spots). I'm having seperate dimmers for each. I would have thought you'd be able to get away with 6 (e.g. 2 rows of 3)
     
  5. Les E

    Les E
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    The Lutron Telume 4 that I was looking at states that is capable of controlling up to 500 watts load.

    From the sounds of it, I will probably have 4 or 6 installed...sounds about right.

    However, I was looking at some halogen bulbs that stated they were dimmable without a transformer. But the ones that did have a transformer did not state you could actually dim these to any extent. Is this true?
     
  6. moviemike

    moviemike
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    I don't know I'll ask my electrician tonight!
     
  7. dj_johnnyg

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    Were the Dimmable Halogen's 240V or Low Voltage?

    As to wether the transformer one's are dimmable, unless it says dimmable, I probably wouldn't take the risk. - Although I don't know what happens if you do dim un-dimmable lights!

    "I take no responsibility if you blow up yourself, your house, your street or the world - Leave that to George Dubbya"
     
  8. Gary Lightfoot

    Gary Lightfoot
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    I only have 3 dimmable 50w 249v halogens in my ceiling (from Argos), and that gives a good atmospheric light in my dedicated loft room (11.6ft x 17ft, see my home page). What's your decor like? Mine is dark grey, but being lighter would look brighter.

    Gary.
     
  9. bfrench

    bfrench
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    Hi guys,
    I know a lot of electricians who use 1 (50w)halogen
    per 1m sq. for low voltage even light distribution. i.e no shadow
    on the surface to be lit. This is for low voltage and from my experience
    lv lamps of 50w are brighter than 240v GU10 50w.


    Barry
     
  10. dj_johnnyg

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    My room is, I believe, daffodil White (Dulux) - Don't know, missus bought the paint.

    I am using 2 light fittings from Argos, one 4 light in a row, and one with 3 in a circle.

    I need to reduce the output of the lights, as they are linked together, and 350W of halogen is bloody warm!
     

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