How are you taking the temps? Are you using thermometers and probes or an IR temp gun? The air temps with the thermometer are an okay guide, but I would use an IR temp gun to get accurate temps on the ground where your BP is.
That's step one.
After you are sure of the temps at the ground (if you are not now) other heating option can be discussed. You likely want a radiant heat panel (RHP) or something similar instead of a bulb. BP's do not need intense lighting and heat from a bulb is not ideal. Further, as you will read below, bulbs are not very safe and cannot be controlled by a thermostat like a RHP can.
How are you controlling these heating elements? A dimmer on a bulb is not the most reliable way to control temps and if the bulb creates too much heat without it, should not be used.
You really need a thermostat to properly control temps. This is pivotal for the safety of your BP.
Let us know the answers to the above questions so we can help.
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