Humidifier

Hey,

I was thinking; I need to raise the humidity in my grow so I was going to buy one of these for my closet:

http://www.argos.co.uk/static/Product/partNumber/0521187.htm

Then I wondered, I'm using an air cooled light fitting which draws air from the closet across the light then out via exhaust.

I have a couple of questions:

1. Will air the moisture just be pulled straight out of there by the ventilation thus making my investment worthless. And,

2. Is it dangerous to have that much moisture being pulled across an electrical fitting.

I may be wrong here because I don't have a full understanding of how rH works.

Thanks,
Psyfiend.