High litereg refers to the new light technology by juwelreg aquarium an improved lighting version on the old style t8 standard bulbsr it combines the existing tube lengths of the t8 with the new bright t5 technologyr high litereg nature tube creates a warm and natural light with a colour temperature of 4100 kelvin r the special light spectrum of the high lite nature promotes plant photosynthesis whilst highlighting the green colours in your aquariumr suitable forr r juwel rio 240r juw