Best light for growing purple haze

A customer has a question and I hope we can get some opinions on it, thanks.

“I want to know what light must I use when growing purple haze in door and how strong the light must be?”

How big is your grow space?

The 2 most popular types of lighting at LED and HID.

With HID I believe you will what about 50 watts per square foot of space. (Ie a 3x3 tent would need 450 watts of lighting). For LEDs I believe you want 35-45 True watts per sq foot so a 3x3 tent would need at least 315 watts but probably closer to 400 to be safe.