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Discussion in 'Wiki' started by derekleffew, Oct 1, 2008.

  1. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Las Vegas, NV, USA
    The phenomenon whereby an incandescent lamp becomes more amber (or yellower) as it is dimmed. The exact formula for color temperature dependent on voltage is: coltemp/COLTEMP = (volts/VOLTS)^0.42. Thus a 3200K lamp at 50% voltage (not necessarily 50% on the control console due to the square-law dimming curve), will have a color temperature of ~2400K.

    The effect can be counteracted somewhat by the use of CTB, 1/2-CTB, 1/4-CTB, and 1/8-CTB color filters.

    For those mathematical masochists, see Planck's law.

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