Here is a classic example of misleading advertisement. The Exo Terra Sun Glo Spot lamp is advertised to produce UVA light, that it beneficial for your reptile, and many people take that as being the UV light that they need. When in actuality, the type of UV that reptiles need to synthesize the calcium and D3 is the UVB wavelength. What happens if your reptile cannot synthesize the calcium and D3 on its own, it's body will take what it needs from the next closest source, it's own bones. The bones' calcium is absorbed by the reptiles body, and often they become weak and flimsy, causing what many people describe as "rubber legs. This is what's considered Metaballic Bone Disease (MBD). And that's the reason behind why obtianing the correct UV wavelength in a bulb is detrimental to reptile husbandry.
So in response to 9200, it would be to your best interest to purchase a UVB bulb from your local petstore. A decent costing one, and one that has a decent life is ESU's "Super UV Coil Lamp". That one will put out decent UVB for up to 7 months before it has to be replaced.
If you do not notice a positive change in your BD after gettign the right lighting, I'd take it to your local PetsMart, that has a Banfeild Animal Hospital located in it, and have them prescribe you some meds (Neo-Calglucon for example)that can help "cure" MBD.
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1.0.0 Bearded Dragons (Pagona Vetticeps)
0.0.4.2 Gold Dust Day Geckos (Phelsuma Laticauda Laticauda)
1.0.0 Yellow Saharan Uromastyx (uromastyx geryi)
2.0.0 Bettas (Dark and Light Blue) 
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