I have been researching UVB lights and I need to know which 1 is better. The ones that have 5% UVB and 30% UVA or 5% UVB and 7% UVA. The Exo Terra has 30% UVA so does a Igauna light would that be ok too? Or should I stick w/zoo med 5% UVB and 7% UVA?