On smaller tanks, its kind of easy to have a hot and cold side, the heat lamp does its job at keeping the whole side warm.
However, I recently got a larger tank, 4.5' Length x 2' x 2'
My current set up, HOT SIDE: left side close to the corner is the hide on top of the heat mat, with the heat lamp more closer to the middle.
COLD SIDE: right side close to the corner is the water bowl with a hide close by.
I kinda have/want 2.5 feet on each side. Now my issue isn't the cold side, it's "cold" and at the right temps.
But my hot side meets the requirements only under and very close to the heat lamp, I don't have the heat lamp on top of the hide as I don't want the inside to get too hot, as the mat is underneath. But that area near the hide or on the left side glass is not hot enough.

So for the owners with larger tanks, how do you keep the whole side hot, I was thinking of running out to the store and buying another heat lamp, do you guys have more than 1 heat lamp?
Or do I upgrade the bulb, its a 100w, fairly new, do I upgrade to a 150w

Thank you