Sorry, but I have to ask again, does the thermometer you just bought have a long wire with a probe on the end and look similar to this?
Even though it seems like you're not getting much heat from the MVB, since it is a 160 watt, it shouldn't be any closer than a
minimum of 18 inches from where your beardie lays on the basking area. The bulbs put out a lot of rays which can be dangerous if too close. It's possible that the bulb is defective. You can do a couple different things, try using a 60 watt household lightbulb alongside the MVB (after you get the distance to the MVB right) then recheck the temps. You may have to move up to a 75 watt or drop down to a 40 watt depending on the temp. You should have a basking temp of about 100 to 110 for a 5 mo old. You also need to have a cool side temp of about 80 degrees. Second choice would be to order either a Megaray or a T-Rex and you can find those here:
http://www.reptileuv.com/megaray-sb-100-watt-self-ballasted-flood-uvb-lamp.php But, I wouldn't go any higher than a 100 watt because those bulbs are strong and throw out LOTS of heat.
Since you're using a MVB and with a 5 mo old, you should be dusting his live food with calcium WITHOUT D3 but is phosphorus-free. If you didn't have a MVB, then you would use calcium WITH D3. Dust with the calcium 5 days a wk, but only 1 feeding a day and with vitamins like Herptivite the other 2 days a wk, but only 1 feeding a day. They need the calcium to help them grow right & the calcium dust &
UVB light work together to process the calcium.
Here's a site that shows the best greens/veggies to feed:
http://www.beautifuldragons.503xtreme.com/Nutrition.html The veggies you're feeding now aren't really very nutritious and shouldn't be fed daily as you'll notice on that site.