I recently made a purchase of a new bulb, an EYE Hortilux 400w Super HPS bulb. Does it take a while for it to 'warm up' for first time use? It's been on for about 15 minutes and its not anywhere near fully illuminated, seems just the cable around the inner filament is illuminated.. I dont want to shut it off, incase it needs to be warmed up and ill end up f'ing it up, so i cant plug another bulb in to test if its the ballast.. to be continued..