Hello my friend👽
In my opinion, you don't need to add the second light during the vegetative stage.
However, I definitely recommend adding it once your plants reach the second week of flowering and beyond.
One more tip: when you add the second light, I suggest mounting the LED drivers outside the tent if possible. This will help keep your daytime grow room temperature below 25°C (77°F).
For even better flower quality, try to maintain nighttime temperatures around 16°C (61°F) during flowering. The cooler nights can help enhance pigmentation and may improve the overall quality of your buds.
Good luck, my friend! 👽💚🌱