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Other Lighting Sources - II - CRI
When looking at alternative ligthing, the notion of the Color Rendering Index (CRI) also comes into play. It is a measure of how well the light source outputs all the colors of objects that are lit by that source. The CRI of an incandescent bulb is nearly 100. Not because it is so "good" but because it emits light in all the wavelengths that we perceive. However, the curve is not quite "natural" and so it doesn't score 100. Because fluorescent lights are "spikey", they end up with a low CRI of 65 (or so) for cool white and up to 80 - 90 for tri-phosphor fluorescent. [note the objection to use of the CRI wrt to fluorescents in the article linked below]. The fact that a light is "warm" or "cool" is not considered in the index. So you have to look at light temperature (color) as well as the CRI to get an idea for the quality of the light. On the left: incandescent. On the right: fluorescent: http://upload.wikimedia.org/wikipedia/en/0/09/SPD.png The more technical minded can peruse: http://en.wikipedia.org/wiki/Color_rendering_index In summary, consider: -light color temperature -Color Rendering Index when looking at artificial light sources for photography. Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: Remove FreeLunch. |
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