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4.3.3 Dimmability of light sources
INCANDESCENT LAMPS
The incandescent lamp is a so-called “thermal radiator”. Current flows in the incandescent lamp
through a thin thread that consists of conductive material – the filament. The filament is heated
until it radiates yellow or white light.
HALOGEN BULBS
The halogen bulb is a special design of the incandescent lamp. These exist in the high-voltage
(HV) for mains power or low-voltage (LV) for low voltage.
High-voltage halogen bulbs are relatively easy to dim. Using a phase dimmer (leading edge
phase control or trailing edge phase control, see Page 90)
, a part of the sinusoidal mains
voltage is capped in each half-wave and thus the lamp is supplied with less effective voltage.
Thereby, gaps occur in the power supply for a few milliseconds; however, these do not have any
noticeable effects due to the thermal inertia of the filament.
High-voltage halogen lamps can theoretically be dimmed without limitations.
During dimming, high-voltage halogen lamps change their colour temperature to warmer
(lower) values and the lamp life usually increases significantly.
The low-voltage halogen lamps can also be dimmed well according to the same principle.
However, it must be taken into account here that the ballast (transformer) that generates the
required low voltage is also dimmable. Details for the compatibility can be found in the product
documentation of the transformer manufacturers.
LED LAMPS
Last but not least, due to the EU-wide ban of incandescent lamps in the framework of the Energy
Saving Ordinance, LED lamps have spread rapidly in recent years. The actual light sources in
LED lamps are light-emitting diodes that consist of semiconductor materials. LED lamps require
significantly less energy than the classic incandescent lamp.
LED lamps also last significantly longer: Assuming approx. 1,000 operating hours for incandescent
lamps, the manufacturers of LED lamps typically state a lamp life of 20,000 – 50,000 operating
hours.
In contrast to incandescent lamps, LED lamps are very fast lamps that start to light immediately
when the current is applied and extinguish without luminescence when the current is switched off.
LED lamps can also be dimmed. While halogen lamps and incandescent lamps operate with
alternating current, LED lamps need direct current. Light-emitting diodes are operated with
operating voltages below 1 V. Therefore, LED lamps need a ballast –either as separate device
or integrated in the lamp.
The tasks of the ballast on the one hand are reducing the mains voltage to LED-compatible val-
ues. On the other hand, the continuous voltage supply of the LED during the unavoidable supply
gaps for leading or trailing edge phase control. If necessary the dimming process is also con-
trolled via the ballast (PWM, for dimmable LED lamps) and the colour temperature adjusted.
Dimmable LED lamps must be expressly labelled as “dimmable” to be able to be operated on
leading and trailing edge phase control dimmers.
LB MANAGEMENT LIGHT 89
Содержание LB management
Страница 1: ...21 LB Management...
Страница 2: ...Company founder Albrecht Jung Ernst Paris 2 COMPANY...
Страница 4: ...4 PREFACE...
Страница 9: ...THE JUNG LB MANAGEMENT 9...
Страница 11: ...THE JUNG LB MANAGEMENT 11...
Страница 15: ...THE JUNG LB MANAGEMENT 15...
Страница 17: ...THE JUNG LB MANAGEMENT 17...
Страница 31: ...Casa Fonte Boa Portugal Photos Jose Campos USAGE SCENARIOS 31 USAGE SCENARIOS 31...
Страница 33: ...01 04 04 04 01 02 03 USAGE SCENARIOS 33...
Страница 43: ...EQUIPMENT OVERVIEW 43...
Страница 51: ...LB MANAGEMENT LIGHT 51...
Страница 111: ...LB MANAGEMENT SHADING 111...
Страница 139: ...TEMPERATURE CONTROL 139...
Страница 155: ...THE CLEVER CONFIG APP 155...
Страница 173: ...OPERATION 173...