There is no definitive answer to this question, as the impact of different grow light wavelengths on plant development can vary depending on various factors, including grow light type, grow light intensity, growing environment, and individual plant characteristics. Generally speaking, blue and red grow lights are thought to be most beneficial during the vegetative stage. In contrast, white grow lights may be most beneficial during the flowering stage. Additionally, different colors and grow light wavelengths are thought to affect plant growth in distinct ways. For example, blue grow lights may promote robust vegetative growth and green leaf development, while red grow lights can help trigger flowering in plants. Ultimately, it is important to experiment with different grow light wavelengths and combinations to find the best fit for your grow setup and plants.