Body: <p>As answered in <a href="https://bricks.stackexchange.com/questions/155/are-transparent-neon-lego-bricks-made-from-a-different-plastic-than-usual">this question</a>, transparent bricks are made of PC (polycarbonate) and as listed in <a href="https://bricks.stackexchange.com/a/204/1090">this answer</a> and <a href="http://lego.wikia.com/wiki/Colour_Palette" rel="nofollow noreferrer">on Brickipedia</a> there are fourteen transparent colors:</p>
  
  <pre><code>40  Transparent (clear) 
  41  Transparent Red 
  42  Transparent Light Blue  
  43  Transparent Blue    
  44  Transparent Yellow  
  47  Transparent Fluorescent Reddish-Orange (Transparent Dark Orange)    
  48  Transparent Green   
  49  Transparent Fluorescent Green (Transparent Neon Green)  
  111 Transparent Brown (Smoke)   
  113 Transparent Medium Reddish-Violet   
  126 Transparent Bright Bluish-Violet    
  143 Transparent Fluorescent Blue    
  182 Transparent Bright Orange   
  311 Transparent Bright Green
  </code></pre>
  
  <p>I am interested in the exact optical properties <a href="http://en.wikipedia.org/wiki/Transparency_and_translucency" rel="nofollow noreferrer">Transparency and translucency</a> of this colors. How much percentage of light is absorbed? Has anyone measured with a prism which wavelength gets filtered out for each color?</p>
  
  <p>P.S.: Why do I want to know? I want to put different kinds of LEDs in transparent bricks and like to know how the light is influenced. There are LEDs in different colours (light temperature) and one can calculate the luminosity at specific voltage and current. I'd like to calculate the luminosity as modified by the polycarbonate which the LEDs are put into.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-10-16T15:56:01.047Z
Comments.Text: If the question is 'How would you measure this?', you would probably be able to get some help from [Physics.SE](http://physics.stackexchange.com/). I would assume you would need a fairly sensitive light sensor to detect the differences in reflected light.
Comments.UserDisplayName: Ambo100
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-11-29T03:18:35.990Z
Comments.Text: Do you want an homemade method for doing this at home?
Comments.UserDisplayName: pcantin
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-12-07T17:22:00.750Z
Comments.Text: @jakob Any more info you could give us?  If you answer the questions from Ambo100 and I we could move forward with this question.
Comments.UserDisplayName: pcantin
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2012-12-07T20:05:53.367Z
Comments.Text: I don't want to measure this but I'd like to have some numbers, charts, technical specifications etc. to know how light from specific LEDs would be changed.
Comments.UserDisplayName: Jakob
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-07-05T02:01:51.210Z
Comments.Text: There are more transparent colours than what's posted in this question. The optical characteristics vary a lot between parts. It depends on the age of the part, its condition, and what kind of part it is. Also the parts are not manufactured to precise optical characteristics, so any two batches of parts of the "same" colour might have different properties. I'm not sure you can get a crib sheet for this, you'd be better off just experimenting with the bricks you get.
Comments.UserDisplayName: Mr. Shiny and New 安宇
Tags: <piece-information><colour>
Title: What's the exact opacity and translucency of transparent bricks?
UserDisplayName: Jakob
ThreadText: # What's the exact opacity and translucency of transparent bricks?
  
  (Asked by: username_0 on 2012-10-16)
  
  As answered in this question, transparent bricks are made of PC (polycarbonate) and as listed in this answer and on Brickipedia there are fourteen transparent colors:
  40  Transparent (clear) 
  41  Transparent Red 
  42  Transparent Light Blue  
  43  Transparent Blue    
  44  Transparent Yellow  
  47  Transparent Fluorescent Reddish-Orange (Transparent Dark Orange)    
  48  Transparent Green   
  49  Transparent Fluorescent Green (Transparent Neon Green)  
  111 Transparent Brown (Smoke)   
  113 Transparent Medium Reddish-Violet   
  126 Transparent Bright Bluish-Violet    
  143 Transparent Fluorescent Blue    
  182 Transparent Bright Orange   
  311 Transparent Bright Green
  
  I am interested in the exact optical properties Transparency and translucency of this colors. How much percentage of light is absorbed? Has anyone measured with a prism which wavelength gets filtered out for each color?
  P.S.: Why do I want to know? I want to put different kinds of LEDs in transparent bricks and like to know how the light is influenced. There are LEDs in different colours (light temperature) and one can calculate the luminosity at specific voltage and current. I'd like to calculate the luminosity as modified by the polycarbonate which the LEDs are put into.
  
  **Tags:** piece-information, colour
  > **Comments:**
  > **username_1**: If the question is 'How would you measure this?', you would probably be able to get some help from [Physics.SE](http://physics.stackexchange.com/). I would assume you would need a fairly sensitive light sensor to detect the differences in reflected light.  
  > **username_2**: Do you want an homemade method for doing this at home?  
  > **username_2**: @jakob Any more info you could give us?  If you answer the questions from Ambo100 and I we could move forward with this question.  
  > **username_0**: I don't want to measure this but I'd like to have some numbers, charts, technical specifications etc. to know how light from specific LEDs would be changed.  
  > **username_3**: There are more transparent colours than what's posted in this question. The optical characteristics vary a lot between parts. It depends on the age of the part, its condition, and what kind of part it is. Also the parts are not manufactured to precise optical characteristics, so any two batches of parts of the "same" colour might have different properties. I'm not sure you can get a crib sheet for this, you'd be better off just experimenting with the bricks you get.  
  
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  ## 0 answers
  
  