IOMEVOII Issue 01 June 07 4
IOM – Evolution II
continuously at more than +6%/-10% of the rated supply voltage of the control gear or tapping.The user must
determine the actual underlying site supply and purchase or adjust accordingly. In this case, the luminaires have
multi-tapped control gear that can be set to a range of 50 and 60 Hz voltages. Different ballasts are used for 50
and 60 Hz. The tappings are shown on the control gear and the limits are shown on the rating plate. They are
selected by changing the position of the wire feeding the ballast. The low voltage version feeds the ballast via
the transformer and for simplicity the ballast selection tappings are shown as 110/115/120V which represents the
incoming mains supply voltage not the volts into the ballast.
If the equipment is located in sections of the system where the voltage is higher or lower than nominal, an
appropriate voltage tap should be selected, but care must be taken to log or mark the equipment so that the
tapping is re-set if the equipment is re-located. If in doubt, tappings should be set on the high side. 10V
maximum drop below nominal is desirable for HPS and advised for MBI. The light output will be reduced. The
figures given are at the luminaire. Where MBI/Metal Halide lamps are used, the tapping must be set accurately
for best performance.
Where shore or construction site supplies are used, which are different to the service supplies, the tappings
should be re-set. If not, advice on the effect of these temporary supplies should be sought from the Technical
Department.
3.4 Lamps
All the HPS lamps used in this range are of a standardised type and there is no preference between makes, or in
the case of HPS, colours. The cap is E40. The luminaire uses tubular lamps. If mixed installations are used, care
must be taken to ensure that the correct lamp is fitted on installation and replacement. The 250W MBI lamp is
the 3.A type that runs on a SON ballast. The control gear supplied for the 400W MBI lamp is designed to run the
standard "SON compatible" OSRAM lamp which has a current rating of 4.2A. Other SON compatible lamps may
be used. The obsolete 3.5A 400W Metal halide lamp must not be used in this luminaire. HPS lamps
substantially maintain their light output to the end of their electrical half life, which can be up to 24,000 hours.
However, lamp replacement at around 16,000 hours is desirable to avoid piecemeal replacement on a large
scale. MBI lamps have a shorter life and higher lumen depreciation, HPS and MBI lamps should be replaced
shortly after they do not light. The ignitor will attempt to strike the lamp for 20 minutes after power is first
applied. If the lamp does not strike within this period then ignition attempts will be stopped until power is
switched off and on again. Also see section 4.0.
The above information is current at the time of publication. The development of lamps and control gear is
ongoing and detailed advice on lamp performance can be obtained from the Technical Department or the lamp
supplier.
Incandescent lamps and tungsten halogen must be selected for the supply voltage. Running at over the rated
supply voltage will reduce life and at greater than +10% will compromise the T rating.
Important: HPS and MBI circuits should not be energised without a lamp fitted. HPS & MBI lamps
with internal ignitors must not be used.
3.5 Mounting
Luminaires should be installed where access for maintenance is practical and in accordance with any lighting
design information provided for the installation. This will usually consist of aiming points and aiming angles. The
mounting arrangements should be secured with lock washers or self locking nuts and bolts.
When the luminaire is mounted vertically it is recommended that the gear compartment should be facing
downwards.
The luminaire is provided with a mechanism to adjust and lock the floodlight to 5-degree intervals. The outer ring
of holes in the adjustment disc gives increments of 30 degrees, this is the coarse adjustment, and is used
second. The inner ring has 6 holes giving offsets of plus 0,5,10,15,20 or 25 degree on the 30-degree increments,
this setting is used first. The numbers indicate the degrees but the holes are not in order. They can be viewed
through the hole in the mounting bracket. The unit is set up with the terminal cover end tightened enough to
allow the unit to be moved smoothly. Fine adjustment is made by selecting the correct hole and loosely fixing in
the mounting bracket. The pivot bolt is then tightened still, allowing controlled movement. The bolt securing disc
to case is unscrewed from the case and reinserted when the coarse adjustment gives the required correct angle.
When everything is correct all bolts are fully tightened. Main pivot 30Nm, case bolt 16Nm, bracket bolt 20Nm.
