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6 x 9 etc.

Discussion in 'Lighting and Electrics' started by len, Aug 16, 2007.

  1. len

    len Well-Known Member

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    Is that a leko measurement? If so, can anyone point me to a conversion chart so I can learn what it is?
  2. Grog12

    Grog12 CBMod CB Mods Premium Member

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    Older ERS instruments were classified by their lens size and focal length.
    6x9 is a 36 degree instrument
    6x12 is a 26
    6x16 is a 19
  3. gafftaper

    gafftaper Senior Team Senior Team

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    Altman still makes and sells a lot of 360Q's. They list for about $120 less than a Source 4 so it's a good choice when money is tight. There's nothing wrong with them, it's solid older technology. Grog's numbers are a close approximate but they aren't exactly correct. A 4.5X6.5 is 47 degrees, 6X9 is 34.3 degrees, a 6X12 is 24 degrees, 6X16 is 16.7 degrees, 6X22 is 11 degrees

    This is a link to the download for their spec sheet. It has a nice little photometric chart in it to help you out.

    Altman 360Q cheat sheet to calculate the size of the area of light:
    For a 4.5X6.5 multiply throw distance by: .88
    For a 6X9 multiply throw distance by: .62
    For a 6X12 multiply throw distance by: .41
    For a 6X16 multiply throw distance by: .29
    For a 6X22 multiply throw distance by: .19
    Last edited: Aug 16, 2007
  4. ship

    ship Senior Team Emeritus Premium Member

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    Some of us still have to convert back to 6x9 etc. measurements when considering stuff like 50 degree fixture beam spread. I know what a 6x9 would look like at X distance... It's what I was raised with.
  5. Footer

    Footer Senior Team Senior Team Premium Member

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    These are the usual substitutions if you make a plot for S4 and it goes into a 6xX house or vice versa. You will see some places out there actually right on the yokes the deg of the unit and what its altman brother is, those houses being places that hang shows very quickly and tend to have older shows coming in.

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