With the Westcott Ice Light Tungsten Gel you change the colour temperature of the Westcott 5500 Ice Light. The colour gel is made of durable and hard plastic that is custom made for this tubular lamp. The standard colour temperature of the Westcott 5500 Ice Light is between 5200K and 5400K. With this gel the colour temperature becomes 3200K. Instead of white, the light is more yellow and therefore warmer in colour.