Humidity problem in Grow room? Will this work?

[M.B.A.]

I started my grow on 12/1(1st 5 plants sprouted), since then I have moved them into a different room under a 400w MH, but the only prolem is the humidity right now. I thought about it for a while and I had a 2L rootbeer bottle in the room, what if I froze a bottle of water, put it in the grow area, should draw all the moisture in the air towards it to condense right? I am testing it right now, at 9am the humidity was at 45% and now it is about 1030am and now at about 52% w/lots of condensation on the bottle!OoOoooo.....

[VapedG13]

I live in washington state... we have 90-100% humity almost all the time.....45% is not that bad at all....exhausting the grow room air helps keep humity down

[M.B.A.]

so 45-50% is good during veg?