they come in different shapes and sizes...it all depends on the company....

ya if it says its hps then u can use i for growing
dryst Reviewed by dryst on . Bulb shapes hey guys, i was wondering what shape does MH and HPS bulbs look like? Because im looking at this foriegn site and i cannot figure out which bulb is ideal for growing plants...heres the link. http://www.hijungu.com/?OVRAW=%EB%9E%A8%ED%94%84&OVKEY=%EB%9E%A8%ED%94%84&OVMTC=standard they say that this is a 400 watt HPS bulb, however it has a belly...doesnt it suppose to look like thin cylinder shaped? Like this? Rating: 5