hi...can't seem to find the answer to this... but is the thermometer that i get supposed to go in the dirt, or on a wall, er whatever? should it be getting hit by the light? it is warmer under the light (400watt hps) so i'm imagining i would want the temp. reading from where the plants are. also...my air temp is seriously at 80...all.the.time. it's a basement grow. we have proper ventilation, but i'm hesitant to buy a/c for a 1 light operation. it just seems like overkill since it's not THAT HOT in there. know what i mean? thanks!