400 to 600wHPS How much would the temp go up?

using 400w HPS through a cooltube right now, area is about 2x1,5m. If i were to switch to a 600( wich im pretty sure fits the same cooltube)would the temp rise drasticaly? or at all? and would i benefit alot from upping to 600 in such small area?

not that much just up grade the out let when ya have the money,and use the old out let has your in let.

My grow room goes up exactly 9 degrees with my 600W set at 75% power. I'm thinking not more then 4 or 5 degrees if everything else stays the same.

You will be fine..