how long does it take for a 400watt hps bulb to get to full temperature im thinking if it runs for an hour it will be fine.

has anyone ever tried this?

if you just think it wont work and have not tried this please dont reply. will all due respect.
brooklyn420 Reviewed by brooklyn420 on . 250watt bulb to a 400watt ballast What happens when you use a 250 watt hps bulb with a 400watt hps ballast i have a self ballasted reflector thats 400watt and i put a 250wat bulb in it and it lit up for 20 minutes until i shut it off. Is this safe? Rating: 5