Philips energy light HF3330 HF3330/01 User Manual

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Congratulations on your purchase and welcome to Philips! To fully benefit 

from the support that Philips offers, register your product at www.philips.

com/welcome.

The goLITE BLU energy light is intended to make people feel more 

energetic, to adjust circadian rhythms and to provide mood relief from 

the winter blues. The medical intended use of the goLITE BLUE energy 

light is to treat winter depression (seasonal affective disorder). This 

treatment should always take place under supervision of a specialist.

The human body uses light cues, such as those provided by the sun, to 

time certain internal functions. Properly timed rhythms regulate mood, 

sleep, energy, appetite and digestion. These daily internal cycles, called 

circadian rhythms, sometimes fall out of sync, resulting in a dysregulated 

body clock.

Unfortunately, modern living has dramatically altered nature’s cues. A 

modern day no longer starts at the crack of dawn and ends at 8:00 p.m. 

Workdays are getting longer and many people face shift-work schedules. 

Additionally, the advent of electric lighting allows social gatherings and 

personal activities to extend well into the night. These factors have 

diminished the body’s natural ability to regulate the body clock.

Rapid travelling across time zones is another source of disharmony 

between the internal clock and the external time, which is referred to as 

jet lag. Proper timing of bright light exposure allows quick adjustment to 

the new time zone.

Besides regulating the body clock, light has direct alerting and energising 

effects and improves our performance. Bright light therapy is also 

successfully used for mood relief, especially for seasonal mood swings.

In countries with long winters, many people experience loss of energy 

and low spirits due to lack of light. These symptoms are referred to as the 

winter blues. They typically start in autumn and may last for several weeks. 

Exposure to bright light sources can help alleviate these symptoms and 

restore the summer mood and summer energy level.