A unique advantage of the new t5 fluorescent tube technology from dennerle is the uv stop feature similarly to the previous t8 models all the new tubes possess a special uv stop protective foil which completely filters out uv light under 400 nm a wavelength range particularly conducive to algae growth in this way algae growth is effectively kept in check allowing aquarium plants to flourish with uv stop anti algae effect premium growing light for aquarium plants creates a warm particul