In general LEDs are an energy efficient and long-lived technology that currently enjoys a great attention and popularity. When we look at herp keeping and its use in terrariums we have to qualify the use of LED lighting. In this field heat and especially heat coming from lamps is desired and LEDs cannot offer this, just as they currently cannot offer UV radiation, at least not at an affordable price. LEDs therefore mainly qualify as nighttime lighting or supplementary daylight in terrarium systems. For animals with low UV and heat requirements e.g. invertebrates and a lot of amphibians and snakes, LEDs can also be used as main or even sole light source. For most terrarium set-ups a combination of LED with other lamps for the heat and UV provision will be necessary.