I would go with a thermostat and undertank heater over the lamps. Leos need belly heat and I found it really hard to get consistant temps on the warm side with heat lamps.

Also, Remember they can overdose on D3. For my adult females I use Pure Calcium on feeders for two weeks and the use d3 for one feeding.

For hatchlings I use Calcium for every feeding and d3 once a weeks instead of every two weeks because they are growing still.

Then keep a dish of pure calcium in the cage.