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  1. #1
    Uranium Lounger
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    I have a room with a vaulted ceiling with the dimensions in the attachment (which is NOT to scale):
    248" wide
    outside walls 95.5" high
    ceiling vault peak 136.5" high

    So if I have this right (please check), the angles at the outside walls to the ceiling are 108.3║, and the length of each side of the vaulted ceiling, from outside to peak, is 130.6"

    I plan to put fixed angle can lights (i.e. mounted on the studs inside the wallboard so the trim is flush with the ceiling) into each side of the ceiling which means they will be set in and point down at 90║ to the angle of the ceiling. So the real question is:

    to distribute the light evenly, so that the center of the light points to the ╝ points on the floor in the rooms width, as in the yellow lines, at what point along the length of each side of the ceiling should the lights be mounted?

    Does the question make sense?
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    -John ... I float in liquid gardens
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  2. #2
    Silver Lounger
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    [quote name='JohnBF' post='790503' date='24-Aug-2009 13:06']to distribute the light evenly, so that the center of the light points to the ╝ points on the floor in the rooms width, as in the yellow lines, at what point along the length of each side of the ceiling should the lights be mounted?

    Does the question make sense?[/quote]

    By my calculation the centre of the light should be mounted 28.885 inches (measured along the ceiling), away from the wall.
    Regards
    Don

  3. #3
    Plutonium Lounger
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    I agree with Don.

  4. #4
    5 Star Lounger
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    Google Sketchup agrees as well.
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  5. #5
    Uranium Lounger
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    Thank you all.

    That was the easy part. How do I adjust for the inverse square effect of light and distance?
    -John ... I float in liquid gardens
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  6. #6
    Silver Lounger
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    [quote name='JohnBF' post='790516' date='24-Aug-2009 15:22']Thank you all.

    That was the easy part. How do I adjust for the inverse square effect of light and distance?[/quote]

    1. Use a floodlight not a spotlight; and
    2. Trial and error on wattage; or
    3. Use dimmer controls to achieve the effect you want.
    Regards
    Don

  7. #7
    Uranium Lounger
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    [quote name='wdwells' post='790518' date='24-Aug-2009 12:26']
    1. Use a floodlight not a spotlight; and
    2. Trial and error on wattage; or
    3. Use dimmer controls to achieve the effect you want.
    [/quote]
    Floods on a dimmer for sure.

    I was partly serious - if you think about it , the section of the floor closer to the wall will be lit more brightly on account of being closer to the light. I'll have to do a little trial and error, but the answer that is pleasing to the eye is probably going to be somewhere between the 29" and 43.5" point (43.5" being one third of the way to the peak).
    -John ... I float in liquid gardens
    UTC -7▒DS

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