And these values are used to describe the color emitted from fixtures when working with lighting.
Kelvin spectrum chart. Just keep in mind that the lower the Kelvin number the more red the color will be. Measured in Kelvin K on a scale from 1000 warmred 10000 coolblue. It is measured in degrees of Kelvin K on a scale from 1000 to 10000.
Light spectrum is the range of wavelengths produced by a light source. As seen on the chart the higher the color temperature the less useful. If you wish to fully understand how the temperature in Kelvin K influences the light output it is a good idea to consider the color chart also known as the Planckian locus graph below.
Spectrum response of white LED temperatures source As you can see above White LEDs fall into this 400-700nm range and dont create much light outside of it so theyll score a very high PAR reading or umolJ efficiency rating but keep in mind efficiency doesnt. Light bulb color temperature is represented in the unit of absolute temperature Kelvin and illustrated by the symbol K. Now step-by-step were going to walk you through the kelvin scale giving visual examples of each temperature.
A T5 tube can be labeled 6500k but. LEDs are available in warm colors low k to match the yellowish light of incandescent bulbs but you can also choose cooler colors high k with whiter or bluer light. Gives off a warm whiteyellow glow candlelight hues.
As seen on the graph 6000 Kelvin lighting falls between the white and BLUE side of the graph. In this chart we see the light is about 4100 kelvin and 93 CRI The R9 drops to 75 which is actually excellent because this is a grow light. However when buying lights from specialty dealers or aquarium specific fixtures then the label on K rating may not even be a good indication of the lights general color tone.
What Shape LED Should I Choose. Most lampsbulbs you buy from a store nowadays will have a Kelvin color rating on them identifying what color spectrum you can expect from them. 4600k-6500k for direct sunlight overcast skies and HMI lights.

