once the temperature has dropped below the re-
quired level. Since the heat source is either working
at full capacity or not at all (all or nothing), there is
likely to be more fluctuation around the desired
temperature than with more sophisticated forms of
thermostat. This can be limited by selecting heating
of a wattage (power) that is ideally suited to your
enclosure and the temperature you are trying to
achieve.
Dimming.
Dimming thermostats vary the flow of electricity to
the heat source, thus increasing or decreasing
temperatures. There is therefore likely to be less
fluctuation from the set temperature. Dimming
thermostats are particular popular in conjunction
with incandescent globes, because the globes
generally last longer, as they are not switched on
and off so often.
Pulse Proportional Thermostats.
These are arguably the most accurate type of
thermostat, as they function by sending small
pulses of electricity to heating devices, thereby
conferring fine control. However, this also makes
them inappropriate for use with incandescent heat
globes.
Thermostats range in price from $40 to $400 or
more, and when it comes to selecting a unit for your
enclosure, this is one area in which it pays to invest
more in a good quality device. Some of the best
mid-range thermostats ($150-$200) offer separate
day and night heating options, as well as timers for
UV lights and humidity control.
Thermometers.
A thermometer should be used to monitor tempera-
tures at various points throughout the enclosure.
Some good quality digital thermostats have in-built
digital thermometers, however, it is still advisable to
use a separate thermometer to cross-check your
thermostat and ensure it is functioning correctly.
Thermometers range from simple single or dual
probe units, through to high-tech infrared tempera-
ture guns.
Heating Devices.
Basking Lights.
Available as both conventional incandescent and
halogen globes, these come in a range of wattages
and remain the ‘go-to’ option for many keepers.
They are ideal for daytime heating of diurnal
species such as dragons, skinks and monitors.
Basking lights produce bright, white light as well as
heat, which is useful since diurnal reptiles instinc-
tively recognise them as a source of warmth. These
globes fit into a standard E27 screw-in ceramic
socket, or dome reflector. Special water-resistant or
‘splash-proof’ basking lights are available for use
with turtles.