as in a home appliance i have no idea, it's power usage has to on it somewhere. check your owners manual.
as said before a 600w light will use the same as a 600w heater/fridge/dryer/playstaion........
if you want to know how much it will cost to run, use something like this.
Costs Calculator...
I'm an old school noob so please be gentle.
Regarding what you folk line your walls with, has anyone used sarking? or have any thoughts on it?
it's reflective/foil on one side. and flame retardant.
here is a quote about sarking in case you don't know what it is, sarking is not a product...