Hey all. I've got 8 plants in my closet at about 4-6 inches tall under a 150w HPS light. Now that they're outgrowing the 150w, I'm getting a 250w light plus ballast from a friend. My only concern is how obvious my power consumption increase is going to be. I'm living on the 7th (top) floor of an apartment building, where the tenants are charged rent with hydro inclusive. I'm a single guy living on my own, so I don't use a ton of power to begin with. Once I installed my 150w light, I generally accepted that I was now using a significant amount more power, but not a necessarily suspicious amount. The building is old, as far as apartment buildings go. I don't have a breaker, but rather a fuse box in the kitchen that my stepdad used as an example to show how old the building must be. I ran into some terms online when trying to find an answer. Apparently some buildings are "sub metered", meaning that electricity consumption can be monitored for each and every individual rental unit. Others, like most of the buildings built in the 50's and 60's, were "master metered", which means the owners just pay one large bill for each building. I figure if my building is master metered, I'm probably ok, as an extra 0.1kw/h isn't going to be a huge change in the overall building's energy consumption. The age of the building fits right in with the master metering era as well, back when electricity was much cheaper. But the building is owned by a corporation, so they might have had the funds available to convert. Is there a way I can tell? I don't want to just come right out as ask one of the managers if my energy consumption is being tracked. Are there any physical give-aways on, in, or around the equipment that's on the bottom side of every building?