Compact lamps are a very neat and energy efficient way of providing light, UV and a small amount of heat into smaller enclosures, and for providing boosting/basking zones in larger vivaria. Using a standard E27 screw in lamp cap means that they can be safely run in any screw fitting bulb holder. Here's what the manufacturer has to say about their product:

These lamps can be used as a sole source of light and UV in smaller enclosures and alongside linear fluorescents to generate a boosting zone in larger vivaria. With a light output many times the wattage used you are guaranteed a nice bright, well coloured enclosure with the inclusion of essential UVA and UVB for a whole year.

• High light output
• Full spectrum, excellent colour rendition
• Produces excellent natural colours
• Needs no ballast, use E27 standard screw fitting
• Not dimmable