Yes, maybe that lamp will fit my cubic tank better (30x30x35cm) and give light to all areas of the tank? So, these chihiros lamps gives a lot of heat? The one I have now does not, but it is only 3,6W.Have a look on C-series lamps - Chihiros C361 LED light with dimmer (18 W, 1850 lm) - chihiros aquatic studio - I have the slightly shorter version for a couple of years on my similar cube aquarium (half the water volume) and it is great. Works with cheap generic automatic sunrise/sunset dimmers, provides plenty of light (I am running it about 80% max) and is water resistant (unlike other Chihiros lights). Just be aware that it heats a lot (like many LED lights though), so don't use it in confined spaces with lack of air/heat exchange.