The advantage of the Exo Terra Repti Glo Compact Fluorescent bulb is its size and the fact that it is self-ballasted. A regular screw fitting is sufficient to operate these bulbs. The spiral shape of the bulb enables vertical or horizontal mounting without compromising performance.It is recommended to combine a high UVB output (Repti Glo 5.0 and 10.0) with a very high visual light output (Repti Glo 2.0) for optimal results. Fluorescent bulbs do not provide sufficient heat. A separate heat source is required in addition. The Exo Terra Repti Glo 2.0 is a general light source with a high visual light output and a very high colour rendering index (CRI) but a lower UVB radiation. This bulb is suitable for snakes all amphibians (frogs toads and salamanders) and nocturnal animals. Plants will thrive under this light as well. It is also a perfect complementary light to a UVB bulb to boost visual light. - Ideal spectrum for all reptiles amphibians. - Stimulates plant growth. - High visual light output. - Stimulates appetite activity and reproductive behaviour through UVA radiation. - High Colour Rendering Index of 98 (CRI) - 6700 K. - Recommended in combination with Repti Glo 5.0 or Repti Glo 10.0 depending on the reptile\'s requirements.