Autoflower lighting

Should you run a metal halide or hps through the entire grow, if i have a metal halide in now and its only a few weeks old is it okay to put my hps bulb in or will it effect anything?

Technically you could run either one, but optimally you would use the Metal Halide bulb during the vegetative phase and the High Pressure Sodium bulb during the flowering stage.

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Either would do just fine. If they’re all flowering at the same time, you could just throw the HPS in.