There are only two ways to ensure that a captive reptile is getting the proper amounts of UVA and UVB light. The best and most sure way is to keep the animal in an outdoor enclosure at all times of the year. By doing this, you will ensure that the reptile will get the UV light that it needs. However, this is usually not possible, as most people do not live in an area where the climate is warm enough for a reptile to stay outside year round.
The other method is much easier for the average reptile owner to acquire. The use of UV light bulbs will help to ensure that the animal is getting both the UVA and the UVB rays that it needs not just to survive, but also to thrive.
With the growing popularity of reptile keeping, UV light bulbs can be found in most pet stores and well as online.