The lamps used in the endurance test are operated above their rated wattage for extended
periods, and shall not be used for the thermal tests. However, it is usually convenient to retain
in the thermal test for abnormal operation those lamps that have been used in the thermal test
for normal operation.
If the luminaire requires a separate ballast and this is not supplied with the luminaire, a ballast
shall be selected for test purposes which is typical of normal production, and which complies
with the relevant ballast specification. The power delivered to a reference lamp by the ballast
under reference conditions shall be within ±3 % of rated lamp power.