Veg and bloom

Yes it's been proven that cannabis and noisy plants grow better with a mix of blue, red and white light. And also far Red and uv for flowering

It’s better to switch to bloom nutrients when in flower if you’re using bottled nutrients. There is enough nitrogen in the bloom nutes to get it through the first couple weeks. You really don’t want excess nitrogen in the flower stage.

I swap from using veg nutrients to bloom nutrients at the end of flowering week 1, as at the start they still require a nice amount of nitrogen