Light spektrum of a metal halid UV lamp

Why is vitamin D3 synthesis by UV metal halid lamps so important for reptiles?

This process is very important for the animals' calcium metabolism. Precursors of vitamin D3 are formed in the upper layers of the skin as a result of UVB radiation and heat. The plasma calcium level in the blood is increased by the liver and kidneys. Calcium is important for bone growth, egg shell formation and strengthening shells in turtles. A deficiency means dreaded metabolic bone diseases (rickets), softening of shells in turtles, risk of fractures, etc...


Keeping reptiles without UV radiation and radiation heat supply is harmful to the animals. This is why UV terrarium lamps are so important for keeping reptiles.

However, too much vitamin D3 can also be harmful – this is called hypervitaminosis. Another advantage of UV metal halide lamps is that the UVA radiation from these lamps reduces excess vitamin D3. A balanced balance between UVB and UVA radiation ensures that hypervitaminosis (poisoning) cannot...

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