Most aquarium light bulbs will have a Kelvin rating between 5000K-20000K.
Kelvin rating chart. The lower the number on the Kelvin scale the warmer and more yelloworange the light will be. Warm colors are the ones that are in the red to white range HID bulb colors and this includes yellow and orange. Osram 54watt t5 6400 kelvin tube.
A bright white light. Mains Voltage Halogen and Incandescent lamps generally dont carry colour temperature information but normally produce a white or warm white colour between 2700k and 3400k. Warm white LED lamps with a color temperature of up to 2700 K are suitable for cozy lighting.
The Kelvin rating that scientists uses refer to specific black body radiation where the color temperature of the electromagnetic radiation emitted from an ideal black body is defined as its surface temperature in kelvins. Gives off a bright amount of blue-white light similar to that of daylight. It is measured in degrees of Kelvin K on a scale from 1000 to 10000.
LED bulbs consume far less. Warm white 2000 to 3000 Kelvin. What it looks like.
Color temperature is measured in degrees of Kelvin on a scale from 1000 to 10000 represented in numbers with a K after them such as 3000K or 5500K. While the Kelvin scale runs from 1000-10000k typically the numbers we would often see crop up in lights pertaining to filmmaking and photography would be found within these bands of kelvin. Best for kitchens offices work spaces and vanities where task lighting is needed.
For aquarium lighting purposes Kelvin rating describes the color or spectrum of sunlight in a given environment. K rating is used to describe color temperature of black body radiators. Colors that have low Kelvin ratings are warm colors.

