Daylighting roof panels: reducing lighting energy in textile factories

Archived article about daylighting and products at the time of publication. Quoted savings, productivity improvements, illuminance, payback, standards and warranties are historical claims, not universal guarantees or current specifications. Assess the actual task, product, maintenance needs and site conditions.

Opportunities to reduce lighting electricity

The original article estimated that lighting represented around 40% of electricity consumption in the textile and garment facilities discussed. Reducing lighting electricity while maintaining or improving lighting quality was therefore presented as a major opportunity for garment factories.

Earlier measures included replacing fluorescent lamps with T8 (2 x 36 W) and T5 (2 x 28 W) systems throughout workshops. The article then proposed daylighting roof panels as another option, describing relatively low investment and potential lighting-electricity savings of up to 70%. These figures depend on the building and operating conditions.

Lighting quality and daylighting design

Appropriate lighting in production rooms and workplaces supports working conditions, safety, productivity and product quality. The original text linked adequate illumination and suitable light colour with improved productivity, quoting a 20-30% increase, and discussed eye fatigue and accident risks from inadequate lighting. It cited 300-500 lux as a typical workshop range. Lighting design should be assessed for the actual tasks rather than treating that range or the quoted improvement as a universal requirement or guarantee. A daylighting system uses windows or translucent panels in the roof and/or walls to admit natural light and reduce daytime artificial-lighting demand.

Products and projects cited in the original report

 The original report described several daylighting-panel suppliers and highlighted Ampelite of Australia, distributed by Fianh. It named Seiko, Posco, Zamil, Shimizu and Dong Son among construction companies or contractors using the products, and Esquel and Tinh Loi garment factories among the cited projects. These references reflect the period of the original report.

The panels can be considered for new factories and for suitable existing roofs to make better use of natural light.

Product specifications and claims at the time

The original product description cited AS/NZS 4256 Parts 1 and 3:1994 and an AS/NZS ISO 9002 quality-management process. It attributed the following features to Fianh Ampelite FRP Skylight: lower costs, payback of 1-3 years, no maintenance, low weight and easy installation, durable materials, and a warranty of up to 20 years. It also quoted heat-transmission reduction exceeding 70% and light transmission above 70%. The article presented daylighting as a way to reduce reliance on electric lighting and associated electrical risks. These historical product claims are not a current specification or warranty; suitability, maintenance and actual savings must be checked for the selected product and site.

Applications and assessing actual performance

The article listed production and assembly workshops, warehouses, textile and garment factories, public buildings, shopping centres and homes as possible applications. It stated that daylighting could reduce lighting electricity, the required number and size of windows, operating costs and environmental impacts, quoting reductions of up to 80% in some projects. Actual outcomes depend on daylight availability, building design and lighting controls.

The original supplier-focused description emphasised raw-material quality, manufacturing technology, product quality and customer service, and reported use by customers worldwide, particularly textile and garment companies. These promotional statements describe the original report rather than an independent current ranking of products.

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