[quote=kitter]
Let me ask you guys this, say the outside temp is 30 F, what exactly could I expect in a decently insulated shed, inside the cabinet, with a 400 w HPS light? What would the temps do? I'm also thinking that a small space heater on at night would be helpful. Which brings me to another question, how much of a fire hazard is a sealed cabinet with a 400w HPS light? I know space heaters are fire hazards. [QUOTE]

well that would matter on how good your ventilation is on your cabinet.....if you have good cabinet ventilation the temperature of the cabinet could be a few degrees hotter than the room that it is in.:thumbsup: