... 3) Use only the exact spectrums (R&B) required for plant photosynthesis4) Built-in cooling system (thermostatically controlled fans ) solve ... WavelengthBlue 450~460nm,Red 620~630nm,660nmApplication:Suitable for the plant -breeding house, garden, farm, green house, horticultural park etc, ... it is also suitable for the flower exhibition because it can stop the growth of the plant, in this way, can widen ...