Sony HVL-F45RM Mode D'emploi page 16

Notes on continuous
flashes
If you use the flash unit
continuously for a short period
of time, its built-in safety circuit
may be triggered to reduce the
flash counts by increasing the
flash frequency.
Also, if the temperature inside
the flash unit rises further,
(overheat indicator) will light
on the LCD panel to indicate
that flash firing is disabled for a
while. In such a case, turn off the
power switch on the flash unit
and leave the unit unused for
about 10 minutes to allow it to
cool down.
Continuous flashes heat up the
batteries inside the flash unit.
Take extra care if you need to
remove the batteries.
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