Philips HB555 - Handbuch (Seite 7)

The Sun
The sun supplies various types of energy.Visible light enables us to see,
ultraviolet (UV) gives us a tan and infrared (IR) in sunrays provides the
heat in which we like to bask.
The sun radiates electro-magnetic vibrations with widely different wave
lengths.The wave lengths of heat rays or "infrared" (IR) are longer than
the wave lengths of visible light.
UV-A, UV-B and UV-C
Ultraviolet (UV) is subdivided into UV-A (longer wave lengths), UV-B
and UV-C (shorter wave lengths).
UV-C seldom reaches the earth as it is filtered out by the atmosphere.
UV-A and UV-B cause the tanning effect of the skin.
In fact there are two processes which produce tanning, and they are
simultaneously effective:
- "Indirect tanning". Primarily UV-B stimulates the production of a
substance called "melanin", which is necessary for tanning.The effect
does not show until a couple of days after the sunbath.
- "Direct tanning".The UV-A and also a part of the visible light cause
quicker browning without reddening or "getting sunburnt".
The solarium
This solarium emits predominantly UV-A, and also a very small amount
of UV-B.
It possesses some important features which make tanning at home
comfortable and convenient.
The unique type of sun lamp used in this solarium emits light, warmth
and ultraviolet, just like the natural sun.
You can position this solarium so that using it really resembles lying in
the sun: your whole body is tanned evenly, from head to toe.
For your convenience, but also to prevent unintended prolonged
exposure (e.g. after falling asleep), a timer-controlled automatic switch-
off operates after 20 minutes tanning.
As it is with the natural sun, it's wise not to have too much of a good
thing! (See section "UV and your health".)
UV and your health
After an excessive exposure to ultraviolet (from the natural sun or
from your solarium), the skin may develop sunburn.
Beside numerous other factors, such as excessive exposure to the
natural sun, improper and excessive use of your solarium will increase
the risk of skin and eye disease.
The nature, intensity and duration of the radiation on one hand, and
the sensitivity of the individual on the other, are decisive on the degree
in which these affects can occur.
7 ENGLISH
ULTRAVIOLE
T (UV)
VIS
IBL
E L
IGH
T
INFRARED (IR)