It will probably raise the temp by 20-30°F (10-15°C), depending on how well-insulated the room is, but only while the light is on!

I heated a small studio apartment I had one winter with a 1000w sodium.

I got a pretty good ventilation system so it seems to only raise the temp a few degrees the room is about 120 cubic feet and my vent fan is pushin 100cfm so that keeps it pretty cool in thair i think for the winter i will have a propane heater outside the room by the intake holes this should raise the co2 level as well as heat the air going in.... i think