The light spectrum necessary for aquarium plants is very different from that of a living room or a LED flashlight. This is the photosynthetically active radiation, called by (Photosynthetic Active Radiation), and a complete spectrum which encompasses all the spectral beaches of the visible light spectrum. It was only from these two components that a perfect light has been produced for aquarium plants! Particularities of the new JBL LED Solar lamps The JBL LED LED lamps exist to replace all the lengths of fluorescent tubes. Basic equipment JBL Solar Natur contains a ramp and a remote control for an easy and professional order. The IR remote control allows you to simultaneously control several JBL LED Solar systems, because the frequency of IR sensors is identical. If you don't want it, receivers must be a little more removed from each other. Each LED unit is then individually controlled with the same remote control. Sea water: the JBL LED Solar Natur was originally designed for freshwater aquariums, but it has also proven itself with fans of sea water, since almost all their corals come from shallow waters where they benefit from full sunlight. By combining it with the JBL LED Solar Effect, the color temperature is 7,800 kelvins. Lengths: the lengths indicated (eg 22W = 43.8 cm) are those of the tube to be replaced. Ramp length: 22 W/38.3 cm; 24 W/49.5 cm; 37 W/68.7 cm; 44 W/79.5 cm; 57 W/99.2 cm; 59 W/109.5 cm; 68 W/139.5 cm Length with calipers: 22 W/45-70 cm; 24 W/55-80 cm; 37 W/75-100 cm; 44 W/85-110 cm; 57 W/105-130 cm; 59 W/115-140 cm; 68 W/145-170 cm. Calculation of ramp length: indicated length, p. ex. For 44 W 849 mm with adapters to replace tubes. After deduction of adapter lengths (always identical): -50 mm -5 mm = 794 mm actual length of the ramp.