Shorter HID Bulbs

Have 3 400 watt MH/HPS fixtures with about 8" room for bulb length. Does anyone make bulbs that are higher wattage but shorter length? So far everything I have looked at larger than 400 watts is too long. The ballast will support 1000 watts but anything bigger than 400 would be welcome.
 
Don't you hate it when you answer your own question 30 seconds after telling the world you are a dumbass?

They call them 'compact' bulbs. Sorry for the frivolous post.
 
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