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It is known that asymmetric cooling after switching the lamp off, can lead to
ignition failure in the next attempt due to condensed mercury on 1 of the electrodes.
Therefore Philips advises to build in multiple attempts (max. 5 for safety reasons) to
start the lamp. Between 2 attempts one has to wait 15s.
Philips suggests after a successful starting attempt to keep the lamp burning for
at least 15 minutes.
The cable has an isolation value of 2.5kV
To limit voltage loss of the ignition pulse, the mutual capacity of the cables may
not exceed 40pF.
To ensure this, Philips recommends to:
Avoid twisted cables
Never tie the cables together
Avoid contact to conductive plates, especially if those are connected to ground
(e.g. via PE)
If possible keep the cables straightened having a mutual distance (of 1 to 2 cm
between the
A suitable electrical enclosure should be provided in the end-product. Creepage
and clearance distances to high voltage parts and traces have to be evaluated in
the end-product. Special consideration has to be given to the distances from earthed
mounting screws to hazardous voltage traces on the lamp driver PCB.
2.3.2 Hot restrike
At max. bulb temperature of 300 oC+ -25oC : 98% ignition reliability of the total
number of switches.
At max. bulb temperature of 300 oC+ -25oC : 99.9% ignition reliability of the total
number of switches.
A restrike of the system can be applied 15 seconds after shut down.
Restrikes of the system can be repeated up to max. 5 times, if the lamp has not
successfully started from the first time.
Philips suggests after a successful starting attempt to keep the lamp burning for at
least 15 minutes.
3
Chapter 1
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