Sharp QT-80W Instruction Manual download pdf (Page 23)

system. The cut-off of the permanent filament heating after lamp ignition is

an advantage.

Further the values of the horseshoe curves also indicate the arrangement

of the lamps within the fixture. To avoid thermal influences of the lamps

minimum distances in between have to be kept. The lamps have to be

placed that the stamp of all lamps is on the same side. For vertical

arrangement the stamp of the lamp always should be placed down. For

circular lamps FC the socket has to be placed down.

The measurement of the cold spot temperature is especially important for

the luminaire manufacturer. This temperature offers opportunities to

optimize the luminaire efficacy.

2.15 End of Life

(EoL acc. to T.2)

Fluorescent lamps use up their emitter during operation. The complete loss

of emitter on an electrode results in a voltage increase in the vicinity of the

electrode filament. As most Electronic control gear have no problem

providing this high asymmetric voltage and with it the required additional

power the temperature around the electrodes rises significantly.

At the moment the international ECG safety standard IEC 61347-2-3 is

under revision. In the future, all ECG must provide a “end-of-life” safety

shutdown which is continuously controlled in order to avoid overheating of

lamp sockets.

The actual status of the standard considers three different test circuits for

Electronic control gear. If an ECG complies with one of the three tests, it

offers protection against the “end-of-life” behavior of fluorescent lamps.

• Asymmetric pulse test (Test 1)

• Asymmetric power test (Test 2)

• Open filament test (Test 3)

The asymmetric power test (Test 2) is directly simulating the additional load

which results from the increased asymmetric voltage in the case of “end-of-

life”. In order to pass the test the additional load may nod exceed a specific

value depending on the lamp type. Most ECG experts see test 2

(asymmetric power test) as the safest “end-of-life” control, because the

direct measurement of the asymmetric additional load mirrors the real lamp

behavior at its end of life. OSRAM does not compromise the safety of

Electronic control gear and has, for quite some time, specified Test no. 2 as

standard test.

2.16 U-OUT

U-OUT a binding ECG label according to safety standard EN 61347-2-

3. The former standard EN 60928, still valid until 2006, allows labeling

of U-OUT either in the product catalogue or on the ECG housing. U-

OUT specifies the largest effective working voltage between

- Lamp terminals

- Each lamp terminal and earth connection, if applicable

This information is important for all components electrically connected on

the lamp side of the ECG.

All components such as lamp cables, sockets (EN 60061-2), isolating

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Sharp QT-80W Instruction Manual Page 23

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