The juwel day lite with a kelvin rating of 6500 creates a lovely daylight effect in your juwel aquariumr for best results combine with a juwel colour lite or juwel warm lite tube place the day lite tube at the back of your aquarium to promote plant growth and the colour or warm lite tube at the front of the aquarium to enhance fish coloursr these t8 1 thick flourescent tubes are suitable for juwel aquariums with t8 light units