Philips QL Induction Lighting Systems - Philips Lighting

1. General information on Philips QL induction lamp systems
1.1 Introduction
The QL lamp systems use a unique physical principle of light
generation. This lamp system is therefore classified in a new
family of sources, the QL induction lamp systems.
QL induction lighting is a breakthrough for professional,
general and special lighting applications; not only because of
its high luminous efficacy and excellent light quality, but
especially because of its unprecedented lifetime. System
lifetime is rated at 60,000 hours, or about 15 years (based
on 4000 burning hrs/year) in many applications, with a failure
rate of less than 10%. Average lifetime with 50 % survivals is
rated at 100,000 hrs. With this unmatched durability, QL
offers substantial savings in direct maintenance costs, as
well in indirect costs. The major features of QL lamp
systems, and their related benefits for the user, are:
Features:
Benefits:
1.2 Lamp system technology and
operation
1.2.1 Operating principle
QL induction lighting is based on a principle, which is
fundamentally different from that of conventional fluorescent
lamps (e.g. TL-D, TL-5 or PL type lamps).
In conventional fluorescent lamps the electric current is
supplied to the gas discharge through the glowing
electrodes. In QL induction lamps the electrical energy is
supplied to the gas discharge by means of a high frequency
electromagnetic field without any electrodes. In conventional
discharge lamps the electrodes mostly are the lifedetermining
factor. Since these electrodes are not present in
QL induction lamps, life of QL lamps can be very long.
Ferrite
No electrodes or filaments
• ultra long life time of < 10 % failure • high reliability and nearly
rate at 60,000 hrs
maintenance free operation
• low lumen depreciation of < 30 % at • lasting high light output right through
60,000 hrs
lifetime
• low operating temperature of • increased safety: more standard
components
luminaire construction
High frequency operation
• high system efficacy (65-70 lm/W) • economic, environment-friendly
lighting in situations with long
burning hours
• no flickering
• restful- non fatiguing light
• no stroboscopic effect
• no noise
Electronic control
• output protected HF generator
Instant (re-)start
• when needed light always instantly
available
3-line fluorescent coating
• no danger with rotating machinery
• restful and non disturbing in
operation
• automatic switch off in case of
failure of lamp.
• more comfort
• extra energy saving feasible in
combination with presence
detectors
• suitable for security and safety
lighting
• useful light immediately after switch
on
• choice of color temperature
• white light
• good color rendering (Ra>80)
Amalgam controlled Hg-vapor pressure
• constant light output over a wide
range of ambient temperatures
Table 1: Features and benefits of QL lamp system
I P
Figure 1: Induction principal
H
I S
3