Compact induction fluorescent lamps from OSRAM. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Electrodeless induction fluorescent lamps. Compact induction fluorescent lamps from OSRAM. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Fluorescent lamps

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In the late 1990s, OSRAM developed and mastered the production of its original electrodeless induction fluorescent lamp, which was called ENDURA®.

The design of this lamp is different in that the inductor is located outside the bulb. The bulb of the ENDURA® lamp is a closed tube, curved in the form of a rectangle rounded at the corners. In the short sections of the rectangle are two inductors with ferrite rings. On fig. 2.21 shows the structure of the ENDURA® lamp.

Such a device allows a significant increase in power and a decrease in the frequency of electromagnetic oscillations that excite the discharge in ENDURA® lamps, compared with IIL, in which the inductor is located inside the lamp bulb. The frequency of the incoming current to the inductor from the QUICKTRONIC® RF generator is only 250 kHz.

The use of stable narrow-band phosphors has made it possible to significantly increase the specific load and reduce the dimensions of ENDURA® lamps, and the use of mercury amalgam has led to a weakening of the dependence of the luminous flux on temperature. The achieved capacities are not limiting. However, the increase in lamp power to 150-200 W and above, apparently, is limited in this design by the levels of electromagnetic radiation, to reduce which special screens are needed.

The design of the ENDURA® lamp is suitable for use in flat luminaires that also house QUICKTRONIC® compact oscillators operating at 250 kHz.

OSRAM's brochures draw attention to the fact that the luminous flux of ENDURA® lamps remains constant over a wide temperature range. They ignite reliably at temperatures down to -30 °C, provide instantaneous re-ignition at almost full power and have good switching capacity. Their service life is 60 thousand hours and is limited by the durability of electronic generators. The noted features of ENDURA® lamps allow them to be used in extreme operating conditions.

Compact induction fluorescent lamps from OSRAM
Rice. 2.21. Structure of the ENDURA® lamp

On fig. 2.22 shows the overall dimensions of ENDURA® lamps, in table. 2.34 are given them specifications.

Table 2.34. Specifications for OSRAM ENDURA® lamps

(click to enlarge)

The OSRAM ENDURA® lamp has been specially developed for applications where lamp replacement is a very labor intensive process, such as outdoor lighting, industrial halls with high ceilings or tunnel lighting systems.

Compact induction fluorescent lamps from OSRAM
Rice. 2.22. Overall dimensions (to table. 2.34)

In the field of creating luminaires with ENDURA® lamps, the company "Adolf Schuch" in Worms (Germany) has especially succeeded. Its experts designed luminaires for extreme climatic conditions in deep freezers, installed a lighting system in 1998, consisting of one hundred luminaires with 150 W ENDURA® lamps, in the chlorine gas workshop of the chemical association "Buna-Leuna-Olefinverbund" and created explosion-proof luminaires (class f "increased safety").

In the US and Canada, OSRAM is known as SYLVANIA and the electrodeless ENDURA® ILL is known as ICETRON. The price of the ENDURA® kit is about 150 euros.

It should be noted that today the production of electrodeless ILLs is actively mastered by companies in Southeast Asia. In particular, DIAS Electronic (China) produces Century lamps. The Hongyan Lighting company from China produces a whole line of electrodeless amalgam ILLs of various shapes with an external encircling inductor (ENDURA analogues). Tungda Lighting from Hong Kong has developed and offers 6 types of electrodeless ILLs such as QL and Genura.

Author: Koryakin-Chernyak S.L.

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