Lumens on colored flood lights


  #1  
Old 12-05-17, 03:26 PM
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Lumens on colored flood lights

Why can't the mfg's list the lumen output of a flood light in a colored selection but do so on a full spectrum white light? Does the specific wave length of a blue, yellow, red or whatever prevent accurate lumen measurement output compared to the same bulb in full white light spectrum? Just curious.
 
  #2  
Old 12-06-17, 07:46 AM
A
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Conjecture only.

1. Colored lights are for decoration, not for energy efficient or safety illumination. So stating lumens ratings for colored lights is not an important issue.

2. One lumen (measured scientifically) of red light looks much different to the average human eye in terms of visibility or illumination compared with one lumen of green light or one lumen of blue light, etc. This makes it confusing to the consumer to compare different colors in terms of lumens.

3. Arguments can be made (at length among scientists in a Victorian high ceilinged library over cookies and tea) as to what constitutes one lumen of red light versus one lumen of green light, etc. One measure might be equating one lumen to so many photons. Any one photon may be of any one wavelength which in turn can be any one color ranging from red to violet (or could be infra-red, ultra-violet. etc./)
 
  #3  
Old 12-06-17, 07:52 AM
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Allan,

I like #2 idea. But I'm still wondering if the wavelength is different in terms of lumen output of one color vs the white light spectrum.
 
 

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