Final Report Lot 9: Public street lighting - Amper

6 TECHNICAL ANALYSIS BAT AND BNAT
Scope: This entails a technical analysis and description of the Best Available Technology
(BAT) and Best Not yet Available Technology (BNAT) that can be implemented on product or
part level. The described BAT is in many cases already available on the market, but is less
frequently used because of the purchase price. It partly provides the input for the identification
of part of the improvement potential (task 7), i.e. especially the part that relates to the best
available technology. In chapter 7 also cost, intellectual property and availability are taken into
account for the selection of options. This is not the case in this chapter and many of the
presented technologies are intellectual property or linked to individual companies. The input of
this chapter is partially the result of an organised visit to the Light and Building trade fare in
Frankfurt 2006 (see also chapter 9 stakeholder consultation). Much research is ongoing and
information is not always publicly available, therefore this chapter can never claim to be
complete but aims to give a general overview. For commercial reasons, brand names are
avoided in the text as far as possible.
6.1 Identified BAT
6.1.1 New luminaires with improved luminaire maintenance factor (LMF)
Luminaires with a low LMF will require an overdimensioning because the LMF depreciation
factor must be taken into account when installations are calculated according to the EN 13201
standard series.
The technical solutions for an increase in LMF are:
• New luminaire designs with a high degree of ingress protection (IP rating see chapter 1).
For example an IP66 class humid and dust ingress protection of the optic compartment
with an innovative double gasket, is a guarantee of the long term cleanliness of the
optical compartment. The ingress protection is also guaranteed after repetitive opening
of the luminaire for lamp or control gear replacement and is designed to withstand the
high temperature variations that can occur.
• Recently new luminaires were presented with glass that has been treated with a
self-cleaning coating that reduces the build-up of external dirt. UV rays activate the
self-cleaning coating to break down and disintegrate dirt. The surface of the glass is
hydrophilic which means that the rain spreads over the glass, instead of forming drops,
and washes away the residue. There is a patent claim on the technology (US 6599618)
filed in 1999 and issued in 2003, therefore the technology is only treated as optional in
this study.
Conclusion:
LMF (@ 4 years) = 0,95 can be expected for medium polluted environments.
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