The Royal Decree on Energy Efficiency in Exterior Lighting (01/04/09) is one of the regulations that must be followed when integrating exterior lighting.

What are the main concepts of this regulation:

  • Applicable to new installations and to existing installations with significant modifications (> 50% of the power or installed luminaires) and extensions.
  • Defines a minimum energy efficiency depending on the lighting (less Em -> more Efficiency).

Establishes the energy rating

Sets flow reduction up to 50% of normal, without loss of uniformity, for installations > 5kW

 Minimal efficiency:

  • 40 lum/W, for night surveillance and security lighting and for signs and advertisements Luminous => eliminates incandescents
  • 65 lum/W for street, specific and ornamental lighting => removes mercury vapour.

Defines the minimum performance and utilisation factors for luminaires and projectors and specifies the minimum consumption of auxiliary equipment according to lamp types and power and defines the on/off system according to installed power

  • < 5 kW (lamps + auxiliaries): photocell
  • > 5 kW (l + a): astronomical clock or centralized system

It establishes minimum performance and utilisation factors for luminaires and projectors, and specifies the maximum consumption of auxiliary equipment according to the different types of lamps and wattages.

Why is LED a good choice for outdoor lighting?

One of the benefits of LED equipment is its compact size, the directional nature of the light, high thermal management performance and increasing light emission.

Therefore, the benefits that this equipment brings us when applied outdoors, as in cities, urban roads and highways improving the emitted flux, light control and thermal management, without forgetting that these equipments have a life cycle of the luminaires from five to seven years without the need to carry out maintenance on them. At the same time, the directionality of its emission and its small size open up new avenues for the development of optical systems with a high control of light distribution, notably improving the combined efficiencies of conventional light source and luminaire.

What should we bear in mind when applying LEDs to outdoor lighting?

A high life span of more than 50,000 hours, compared to conventional lighting which means about 24,000 hours. Thanks to the small size of the light emitting diodes facilitates the direction of light, favoring energy savings.

Incandescent vs. Led technology.

Electricity cost estimated at 0.14 €/kWh.


Pot. Bombilla incandescente a sustituir (W)  Pot.LED (W) Ahorro energía (kWH) durante la vida útil LED (50.000h)  Ahorro factura eléctrica (€) Ahorro en emisiones C=2 (kg CO2)
40 9 1.550 186 1.162
60 11 2.450 294 1.837
75 15 3.000 360 2.250
100 20 4.000 480 3.000
150 32 5.900 708 4.425

Fuente: EOI




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