Repatriums filter 70% of the light through the mesh. That's the statistics given by the company. While they are a great size for the investment, I'm afraid they are only good for use outdoors or with dense forest species, not veiled and panthers. Since you mentioned you can't afford another cage, you can use small pieces of wood and rest the lip on the fixtures on this, being sure the bulb is not in contact with the wood. Be aware that crickets have been known to chew through and escape reptariums and the mesh will become more brittle and fragile with age and exposure to light. You will need a more suitable cage at some point.
If you aren't getting the heat you need from the bulbs you are using, you need higher wattage bulbs and/or to decrease the distance between the bulb and the basking spot. Be wary of the the fact that veiled have a high casque and that is prone to burns, if attention isn't given to bulb placement.