Sera Blue Sky Royal[Power - 15W]

12,000 Kelvin - Intense bright blue light - Simulates light conditions in tropical rivers and lakes.

Due to its perfectly balanced spectrum, sera Blue sky can be used as a single tube or in combination with sera Deep sea, as a light source for marine aquariums.

The combination with SERA Tropic Sun is optimal for freshwater aquariums.

Good aquarium lighting isn't just for fish — it's also vital for any live plants growing in your aquarium. Plants need light for photosynthesis to synthesize food from carbon dioxide and water. Tropical plants, for example, need 12 hours of light a day, while colder water plants need the light to vary with the seasons.  

IMPORTANT: The service life of the aquarium lamps is 12 months. The spectrum of the lamp gradually changes and after this period it can no longer function as an aquarium lamp with the corresponding purpose.

For best results, replace aquarium lights every 12 months. 

Essentially, watts tell you how much energy a light consumes, lumens tell how bright a light is, and Kelvins tell the light color.