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IMO a 400 watter is perfect for a tent. It isn't all that much running a 400w lamp 18 hrs a day.
Here is a simple formula that can tell you how much you will spend.
You will need to find out how much you pay per kilowatt hour
kilowatt hour x wattage x hrs of operation
Lets say your electric company charges you 8 cents/kilowatt hour. 8 x .400 = 3.2c/hr, so if it's on for 18 hours a day during veg. thats 57.6c per day, or apx $17.25 a month to the bill.