A Lighting Manufacturers Problems in Meeting the Requirements Producing Dark Sky Friendly Luminaires. Peter Portelli Technical Manager PIERLITE PTY LTD Tuesday 22nd July 2003

Introduction Manufacturers are driven to make luminaires to the need of the client. The client can be a number of stakeholders. These stakeholders can be the consultant, enduser, designer, electricity authority, maintenance staff, you and me. Luminaire design today particular outdoor type units also has many other factors influencing the shape and performance. Lighting pollution sky glow light trespass disability and discomfort glare. The challenge is to balance out all the needs and wants.

Customer needs $ ENVIRONMENT STANDARDS Luminaire design is a balance

Luminaire design today is very different to what it was some years ago. Stakeholders today are more conscious of good lighting practice and the effect on the environment. As a result, Standards are introduced to help safeguard these values. Aiming a floodlight up into the sky to light a building is now considered unacceptable. Installing a streetlight with a bare lamp in a glass bowl is equally unacceptable. Specifications from consultants are more and precise and stringent than ever before. As a result the general design of outdoor fittings are changing to meet these needs.

London Exchange 4,000 Candle Arc lamps on 25.5m (80ft) masts Siemens Bros 1881

Better cut off Floodlights

Designing a new P category Streetlight A case study.

The Ideal Category P streetlight. Made from marine grade die cast aluminium. Lamps and control gear to be latest technology and be energy efficient. Longer lamp life to allow longer periods between replacement. Provide visual guidance and orientation along the road. Low glare light source rather than a point source like HID. Minimum of IP65 for both lamp and control gear compartments. Two lamps positioned side by side rather than one lamp only. Highly specular reflector improving efficiency. Acrylic diffuser with built in gasket to prevent loss of gasket during lamp changes. Stainless steel diffuser clips. Easily replaced photocell. Performance equivalent to or better than the current 80W MV unit. Light source to white in colour, with higher CRI above 80. Meet stringent AS/NZS1158 Glare control, limitation of spill light, upward waste light, correct illuminiance on the road. It has to look good.

Optical system

Design of the Category P streetlight Production Concept

In Conclusion Basically there is not a problem for the light fitting manufacture. Provided that the client and manufacturer can work together to balance the scale of needs and the environment. Outdoor lighting is becoming a challenge to all stakeholders. Outdoor environmentally sensitive light fittings is now and the future and the luminaire manufacturer is ready to meet this challenge.