EB stands for electronic ballast. EBs and dimmable EBs are increasingly being used instead of conventional or low-loss ballasts. They reduce power consumption and make for a high degree of visual comfort. Other advantages: higher luminous efficacy of lamps, flicker-free instant starting, longer lamp life, automatic disconnection of defective lamps.

Elastic deformation

Part of total deformation of a stressed plastic which disappears after removal of the load.


A macromolecular material which returns rapidly to its initial dimensions and shape after substantial deformation by a weak stress and release of the stress.


ENEC is the European safety test symbol for luminaires and other electrical products. It is awarded by independent test and certification institutes in Europe. In Germany this is VDE, which awards products tested in Germany the testing agency number "10". The acronym ENEC stands for European Norm Electrical Certification.

Energy efficiency index (EEI) of ballasts

To enable less energy-efficient ballasts to be identified more easily, the European Union has adopted a special ballast classification system. Class D ballasts have not been admissible since the end of 2002, Class C ballasts since the end of 2005. Classification is by Energy Efficiency Index (EEI, based on the CELMA classification scheme for ballast directive 2000/55/EC):

A1  Dimmable electronic ballasts (EBs)
A2  Electronic ballasts (EBs) with reduced losses
A3  Electronic ballasts (EBs)
B1  Magnetic ballasts with very low losses (LLBs)
B2  Magnetic ballasts with low losses (LLBs)
C   Magnetic ballasts with moderate losses (CBs)
D   Magnetic ballasts with very high losses (CBs)


EPDM (Ethylene-propylene-diene copolymer). Elastomeric, thermoplastic terpolymer. The diene is butadiene, where remaining double bonds can be made to form branching and cross-linking. M stands for monomer.

Epoxy resin (EP)

Synthetic resin containing epoxy groups which can be cross-linked to form unmeltable thermosets by multi-functional substances (hardeners) e.g. two-component adhesives and floor coverings.

Explosion-protected luminaires

Explosion-protected luminaires meet fire protection standards and more. For zone 20 applications, for example, they conform to degree of protection IP 5 upwards and feature an impact-resistant luminaire enclosure. DIN VDE 0165 defines zones according to the risk of explosion present. Luminaires used in them need to be designed for the appropriate zone. Zones 0 (constant long-term risk), 1 (occasional risk) and 2 (short-term risk) are for combustible gases, vapours and mists; zones 20 (long-term or frequent risk) and 21, 22 (short-term risk due to occasional swirling) are for combustible dust.

Escape sign luminaires

Safety signs for escape routes are available as back-lit signs - i.e. escape sign luminaires - or illuminated safety signs. Both need to conform to certain quality criteria set out in DIN EN 1838, notably in terms of colour, luminance of the safety colour green, luminance contrast and sign dimensions.


A processing method where heated or unheated plastic is forced through a shaping orifice to form one continuously formed piece.

Extrusion blow moulding

A thick-walled parison is freely extruded vertically downwards in moulding cycles. Very high-viscosity polymers with high melt strength are required so that the wall strengths do not change as the parison is pulled down under its own weight. The parison is blown up in a two-part mould and, through cooling, takes on the shape of the required hollow container. Used in under-bonnet automotive applications (e.g. with PA).