How many lowryders under 400??

like the header says, i got ak47 autoflowering lowryders coming in and am curious how many i can have going at once under a single 400 watt light. ive allways only done 4 due to space constraints. but with a new room i have more then enough room. i was thinking 6, maybe 8 if i rotate them, not really looking for alight mover, checked them out but alot of setup and just more then i need. so let me know what you guys think!

I think 8 autos under a 400w would be no problem...

I've never tried autos though...

I currently have 5 regular plants under a 400w and they're doing great!