Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 12 Page 30 of 265
2.11 Controller Load Power Consumption & Dimming Transformer Selection
This section describes the method used to determine that the controller can supply
the total lamp load required, how to select the correct dimming transformer and how
to determine the overall power used for estimation of site running costs.
In order to do this, the power taken by the lamps needs to be calculated. Use the
following table to determine the average power taken by the different types of lamps.
Up to date information on all Helios LED and LED Nearside products can be found
in the Helios General Handbook 667/HB/30000/000.
Bright
Dim
120V
Dim
140V
Dim
160V
Tungsten filament 65 35 - 53
65W WAIT Indicator 65 35 - 53
40W WAIT Indicator 42 22 - 25
50W Tungsten Halogen High Intensity 63 20 27 33
Regulatory sign (wattage)
(Use this for estimation of power consumption)
30 - - -
Regulatory sign (Volt-Amps)
(Use this for calculation of current)
76 - - -
Helios LED – Regulatory Sign LV 8 - - -
Helios LED – Lamp Monitored Version (LMF) 28 - - 7
Helios LED – Non Lamp Monitored Version 28 - - 8
Helios CLS LED – with (LMF) 28 - - 13
Helios CLS LED – NLM (no LMF fitted) 16 - - 4
LED Wait (Measured at 48 Volts) See Note 1 9 - - 3.5
Red/Green Nearside See Note 1
18 - - 5
Call Accept See Note 1 9 - - 2.5
Table 3 – ST900 Lamp Load Per Aspect (Watts)
Note that the values given in the above table relate to the average lamp power plus
power losses involved in driving the lamp.
The 500VA (LED) variant of the dimming transformer only has a single tap of 154V.
For all power calculations the value for 160V may be used.