Originally posted by Ltspd:
On my 250w AB HQI bulbs the nipple is pointing down on both of them. That is the only way they can be installed.
That is the
outer nipple that is always pointing down. The inner nipple is always pointing sideways. The only one that counts is the inner one.
On the 150w Ushios the nipple is pointing up, and once again that is the only way they can be installed.
I don't have any of the 150 watt size but I do have the 250 watt size. On my 250w Ushios the inner nipple is always pointing up and the outer nipple is always pointing down and that is the only way you can install them.
So I guess we could say it doesn't matter which way your nipples are, as long as you got them 
Some of us should also get a new pair of glasses so we could see that there are two different nipples involved here and the only ones that really matter are the
inner ones and they should not be pointing down.
Ninong
