does lumens / square foot = foot - candles ?

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Jonathan Chertok

November 17, 2020 22:03

trying to review some notes here. is this right? if i end up with a value of 33.4 lumens / sf this is the same as 33.4 Fc? THANKS

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  Jonathan Chertok November 17, 2020 22:08

  or wait. is this equation E (in Fc) = lumens (in lumens?) / area (in square feet)? or what is the denominator units in this equation? lumens?
  so lumens per square foot is the same as four-candles?

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  Adelina Koleva November 27, 2020 16:52

  To answer your question, yes. However, I recommend checking out Norbert Lechner's Heating, Cooling, & Lighting. He explains this in Chapter 12. Elsewhere in his book he also explains the cosine law, or how to calculate the quantity of light hitting a surface for a given angle of incidence. Once you read and understand it, everything on illuminance should be clear. (FYI, I recommend skipping MEEB for lighting - it goes much deeper into it than the scope of the exam.)
  
  Hope that helps. Good luck!

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  Jonathan Chertok November 27, 2020 17:29

  THANK you for this tip Adelina! i think i am going to create a wiki site for “tips” - or something!

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