Choosing the Right Color: 1  Light color is measured on a temperature scale referred to as Kelvin (K). 2  Lower Kelvin numbers mean the light appears more yellow; higher Kelvin numbers mean the light is whiter or bluer. 3  Most ENERGY STAR certified bulbs are made to match the color of incandescent bulbs at 2200-3000K. For a whiter light, look for bulbs marked 3500-4100K. For bluer white light, look for bulbs marked 5000-6500K.
Visible Light. Visible Light Waves Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light.
Light, Prisms, and the Rainbow Connection White light is composed of all the visible colors in the electromagnetic spectrum, a fact that can be easily proven through the use of a prism.As light passes through a prism, it is bent, or refracted, by the angles and plane faces of the prism and each wavelength of light is refracted by a slightly different amount.Violet has the highest frequency and is refracted the most.Red has the lowest frequency and is refracted the least.ight, Prisms, and the Rainbow Connection White light is composed of all the visible colors in the electromagnetic spectrum, a fact that can be easily proven through the use of a prism.