UV-B lamps are lamps that emit a spectrum of ultraviolet light with wavelengths ranging from 290-320 nanometers. This spectrum is also commonly called the biological spectrum due to the human body's sensitivity to light of such a wavelength.
There are several different types of siblings. 1  Full siblings (brother, sister): These siblings have the same father and mother. 2  Half siblings (half-brother, half-sister): These siblings have one parent that is the same. They either have the same father or the same mother. Step siblings (stepbrother, stepsister): These sibling have different fathers and mothers but one of their parents is married to a parent of the other one.
A half sister is a sister who is blood related by one parent. For example you mom had a child with one man; then your mother met another man and had another child. The two children are link by the mother. A stepsister is a non blood related relative by the marriage of one of your parents.