When light reaches the water, much of it is reflected from the surface. The angle of light reflection depends on the entry angle. In nature, the amount of light that penetrates the surface changes with the position of the Sun throughout the day. Around noon, when the Sun is at its highest, the amount of light is high and decreases due to reflection depending on the time of day. In small rivers in tropical forests, light is further reduced in the morning and afternoon by surrounding trees and aquatic plants. Therefore, the time during which aquatic plants benefit from the appropriate amount of light is limited to only a short period around noon. This is the moment when photosynthesis of aquatic plants is exceptionally intense. Grand Solar I is a lighting fixture that can reproduce this phenomenon in an aquarium. It consists of two compact fluorescent lamps and one HQI lamp. The change in light intensity in nature can be reproduced by turning two different light sources on and off separately. For example, fluorescent lamps are on for 10 hours a day and a metal halide lamp is on for 4 to 6 hours during this time. This allows you to turn on the relatively weak light of fluorescent lamps in the morning and evening, and around noon, illuminate the aquarium with intense metal halide light, allowing plants to perform intensive photosynthesis.
© foto: Takashi Amano, AQUA DESIGN AMANO CO., LTD.
2024 – Aquarius & Aquadam, Adam Paszczela
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