Cold light enlarger
An enlarger using cold cathode illumination. A diffusion type of enlarger. These types of enlarger heads scatter the light more evenly across the surface of the negative.
Cold Lights
"Cold lights" are electronic flashes, much more powerful than the ones on your camera but basically the same idea. Studio strobes come in two flavors: monolights and powerpack/head systems.
Inside any building, you will also have the problem of different light sources to contend with from the cold light of the daylight coming in through large windows, to the artificial light of the interior lighting.
The fluorescent type is referred to as a cold head, or cold light source, or diffusion enlarger (the reason should be pretty obvious). This type is preferred by many, as it gives a softer, often more even illumination.
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Continuous lighting that generates more light than heat, e.g. fluorescent lamp, LED lamp, cold light
Strobes Edit
camera with ring flash
image by Askr! ...
These types of enlarger heads scatter the light more evenly across the surface of the negative. One advantage of the cold light head is that it can render more subtle tonal gradations and will minimize the effect of dust and scratches on the ...
The sunlit portions of the mountains will be illuminated by the very warm rays (red and yellow light) of the morning sunrise while the shadow portions of the mountains will be receiving very cold light (blue) from the sky overhead.
Mine had a light leak near the negative carrier that fogged my papers (loss of crisp highlights). I fixed it by first draping my darkcloth around it and then by placing a rubber gasket around the area where the cold light head sat on the negative ...
 See also: Light, Photograph, Camera, Image, Stops
  
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