Page 302 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

292 CHAPTER 11 Vehicle Sensors and Lighting
10,000 K
6000 K
4000 K
Xenon short-arc
Fluourescent
Cold white LEDs 7000 K – 10,000 K
Natural white LEDs 5000 K – 6500 K
Warm white LEDs 3600 K – 4000 K
FIGURE 11.4
Color temperature chart.
3000 K Incandescent
2000 K
1500 K
High pressure sodium Candle flame
Match flame
temperature. Color temperature is described as the overall light output, expressed in a Kelvin scale, as depicted in Figure 11.4. For an expanded discussion of underwater optics and light source place- ment considerations, see Section 10.9.
11.2.2 Practical applications
This explanation of lighting comes from Ronan Gray, an expert on the subject. The need for under- water lighting becomes apparent below a few feet from the surface. Ambient visible light is quickly attenuated by a combination of scattering and absorption, thus requiring artificial lighting to view items underwater with any degree of clarity. We see things in color because objects reflect wave- lengths of light that represent the colors of the visible spectrum. Artificial lighting is therefore nec- essary near the illuminated object to view it in true color with intensity. Underwater lamps provide this capability.
(From Poissonnet, 2008.)