No, both colors are essential for plant development. This is the rationale behind all the growers who had those purple lights in their grow settings.
Blue light is crucial for plants in the seedling and vegetative stages because it encourages the absorption of chlorophyll and photosynthesis, which helps plants develop robust roots and stems. On the other hand, red light aids in flowering and fruiting. It also aids in the plant’s germination, bulb development, and root growth at the early stage.
Red and blue grow lights were designed for this purpose. However, the industry now prefers full spectrum white LED grow lights over red and blue ones. That being said, the two colors that are most crucial for plant growth are blue and red light.