Also make sure you are measuring your temperatures with either a DIGITAL PROBE, or a TEMP GUN.
The dial ones can be off about 10-15 degrees. Also, when measuring the BASKING spot, make sure the probe or gun is ON the spot. For example, if you have a log in the middle of the hot side, make sure the probe/gun is ON the log. If it's in the air or the corner, it only measures the "air", not the heat beam under the bulb.