We give away total of ten lights. Participant requirements : a. When was your tank established? b. What equipment are you using now? c. The full view picture of the tank. d. Tank size (length * width * height) e. Share the event to the aquarium related circles and take a screenshot The selected person records the light growth, light mixing effect, PAR value, spectrometertest for one month, and records at least once a week. Select three people: light 2+ bracket 2 + controller 1 Select four people: light 1 + bracket 1 + controller 1 Activity end time: Dec 7th, 2018, US Eastern Time.