How Philips' Intense Pulsed Light Technology Works; Hair Growth; Working Principle - Philips TT3003 Benutzerhandbuch

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how Philips' intense Pulsed light
technology works

hair growth

Hair growth rates differ from person to person,
depending on age, metabolism and other factors.
However, everyone's hair normally grows in 3 phases.
1 Growing phase (anagen phase)
The hair grows actively from the root. In this phase
the concentration of melanin is highest. Melanin is
responsible for the pigmentation of the hair. Melanin
concentration is also the determining factor for the
efficacy of this method. Only hairs in the growing
phase are susceptible to treatment with light.
2 Degradation phase (catagen phase)
Hair growth stops and the root shrinks before the
hair sheds.
3 Resting phase (telogen phase)
The old hair separates from its hair follicle and sheds.
The follicle remains at rest until the biological clock
tells it to become active again and grow a new hair.

Working principle

The appliance works by heating up the hair and root
beneath the skin. The melanin in the hair and hair
root absorbs the released light pulses. The darker the
colour of the hair, the more light can be absorbed.
This process stimulates the hair to go into the
resting phase.
The hair now sheds naturally and the hair growth is
inhibited. Hairs can take one or two weeks to shed.
Optimal hair removal cannot be obtained with a
single session, since only hairs in the growing phase
are susceptible to treatment with light. During a
treatment, hairs on the treated area are usually in
different stages of the hair growth cycle. To effectively
treat all hairs you have to repeat the treatment
every two weeks for a few times.