worried abt beardie not getting enough heat

[spikey_the_beardie]

I have recently bought a 40-gallon tank for my bearded dragon and I'm worried that he isn't getting enough heat since the average temperature for a bearded dragon is 100°F and he is getting 85°F. I have a ZooMed mini combo deep dome dual lamp fixture with a ZooMed Repti Basking Spot Lamp that has 100W. Right now I'm trying to find a ReptiSun UVB 10.0 with the right size that fits in the dual-lamp since I bought the wrong size. If he isn't getting enough heat, what can I do to fix this? Here are a few images about the topic.

 

[hdochow]

awesome! sounds like you've hit your mark. now just to see what it does with a full day tomorrow instead of just a couple hours.

 

[spikey_the_beardie]

awesome! sounds like you've hit your mark. now just to see what it does with a full day tomorrow instead of just a couple hours.

Alrighty then.