THE EYE SEES COLOR
Visual Spectrum of Sunlight ranges from Ultra Violet to Infra Red. The
Visual Spectrum of Sun Light can be seen when Sun Light passes thru
water droplets, we see a Rainbow. The same thing occurs when Visual
Light passes thru a Prism. For simplicity lets call the Visual Spectrum, Red, Green and
Spectral light (Such as sunlight), falls on a white sheet of paper, the
eye sees White, because it sees the full Spectrum of colors in the
light. When the paper absorbs all of the Spectral Colors, the eye sees
the paper absorbs all but one of the colors, lets say, Blue and Green;
the eye sees the other color; Red.
Spectral Light falls on a Tomato, the pigment in the Tomato absorbs the
Blue and Green and reflects only the Red Light.
Spectral Light illuminates a Green Pepper, the substance in the Green
pepper absorbs the Red and Blue and reflects only the Green Light.
is easy to understand that if the light source itself is deficient in
some of the Spectral colors, then those colors will not be transmitted
and therefore the eye will not see those colors, same as if those colors
were absorbed by pigment in the object illuminated.
Rendition Index. Is
a measurement of the Spectral Colors that most resembles that of
sunlight (1 to 100); where 100 is most resembling Sunlight. 90 and above is considered a practical range.
MR16 lamps are rated above CRI 90 when the filament is heated to its
brightest. The MR16 when energized by 12volt AC, (alternating current)
it only produces a Color Temp. of aprox. 2800 degrees Kelvin and is high
in Red and Yellow and deficient in Blue and Green when compared to a
filament energized by a 12volt DC (Direct Current) source which produces
a temp. of 3200 degrees Kelvin. The difference is because AC current
actually turns off 60 times a second and thereby the filament does not
get as hot as when energized by Direct Current even though they both are
lamp in the Standard IDEAL PORTRAIT LITE, is the GU10. The GU10 operates
on 120volts AC, It has a small transformer attached to the MR16 that
converts 120volt AC to 12volt AC.
PROFESSIONAL VERSION of the IDEAL PORTRAIT LITE has a Transformer and an
inverter in the line cord that not only transforms the 120volt AC to
12volt AC; but it also inverts the AC to DC which enables the filament
to burn at a higher temp and therefore a higher CRI.
light emitted by the Professional version has more blue than the light
from the Standard version in addition to itís being brighter.
above is easily demonstrated by comparing two 16 X 20 white boards, each
one illuminated by the beam from either a Professional version or a
recommend the Professional version; Particularly for Studio displays,
expensive wall portraits and paintings.