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 the juwel high lite day ensures optimum luminosity in your aquarium the special light spectrum of the high lite day fluorescent lamp makes the most of the natural colours of your animal and plant worldr bull brilliant colour effectsr bull colour temperature of 9000 kelvi