Compact UVB bulbs are perfect for smaller enclosures where the use of a UVB flow tube would be impractical. Compact UVB bulbs do not require any form of controller or ballast as they are self-ballasted bulbs. Compact UV bulbs emit only a very small amount of heat and their low wattage ensures they are very energy efficient.
Mercury vapour bulbs (MVB's) are combination bulbs that provide both heat and high levels of UVB into a focussed area. MVB's cannot be used with a thermostat as they have to run at full capacity in order to keep the mercury vaporised (which causes the bulb to emit UVB). Therefore Mercury vapour bulbs are most suited to use in particularly large enclosures or open topped and mesh topped enclosures where excess heat can dissipate without raising the ambient temperature inside the enclosure beyond the preferred range.
WHY ONLY ARCADIA UVB PRODUCTS?
There are many manufacturers of UVB products but the preferred brand of professional zoologist Will Thomas (MRes Natural Sciences, BSc Zoology with Marine Zoology) is Arcadia. After 11 years using this brand he has had no complaints or issues and therefore believes strongly in the use of their products. Will Thomas (MRes, BSc) is not in any way associated, affiliated or paid to endorse Arcadia lighting products and alternative UVB products are available from many other manufacturers.