I have bought a SunGlo Daylight basking spotlamp,but it only provides UVA light. Meaning it unable to help in vit D synhesis?

I have seen solar glow sun simulating light which provide UVA , UVB light, Does it mean i need to change to this lamp?

If only 1 lamp is used, which type is the best? i have seen so many like daylight lamp etc..