To accomplish the objectives of the Task, the Participants will carry out research and developments in the framework of the following four Subtasks and one joint working group:

• Subtask A: Market and Policies
• Subtask B: Daylighting and Electric Lighting Solutions
• Subtask C: Methods and Tools
• Subtask D: Case Studies
• Joint Working Group: "Lighting Retrofit Adviser"

Subtask A: Market and Policies

This subtask will identify the various possible approaches of retrofitting daylighting systems and lighting installations in buildings. It proposes to provide key figures concerning costs (Total Cost of Ownership) and identify barriers and opportunities concerning lighting retrofit actions. Beyond costs, barriers could be related to inertia of stakeholders, poor habits or lack of knowledge. Opportunities may go beyond reduction of costs, reduction of energy requirements and may relate to added benefits for investors, building owners, building managers and occupants. The work of Subtask A will be structured into four projects:

A.1 Global economic models
A.2 Barriers and benefits
A.3 Building Energy regulation and certification
A.4 Proposal of action concerning value chain

Subtask B: Daylighting and Electric Lighting solutions

This Subtask will deal with the assessment of existing and new technical solutions in the field of façade and daylighting technology, artificial lighting and lighting controls. For replacement solutions the subtask will identify and structure existing and develop new lighting system technologies. The work of Subtask B will be structured into six projects:

B.1. Definition - system characterisation
B.2. Definition of (regional) baseline conditions
B.3. Review of state of the art technology and architectural solutions
B.4. New technical developments
B.5. Measurements of selected state of the art and new technologies
B.6. Source book

Subtask C: Methods and Tools

Whether an intended retrofit is technically, energetic and economically meaningful is at the moment not self-evident for the majority of stakeholders and building designers. This subtask will focus on simple computer design tools and analysis methods in order to improve the understanding of retrofit processes. This will incorporate energy and visual comfort analysis as well as the financial aspects of lighting retrofit solutions. It will also encompass advanced and future calculation methods aiming at the optimization of lighting solutions, as well as energy auditing and inspection procedures, including lighting and energy performance assessments.

The work of Subtask C will be structured into five projects:

C.1. Analysis of workflow and needs
C.2. State of the art review
C.3. Development of a simple integrated rating model
C.4. Energy Audit and Inspection Procedures
C.5. Advanced and future Simulation Tools

Subtask D: Case Studies

Case studies are essential to communicate lighting retrofit concepts to decision makers and designers. Therefore, the main aim of Subtask D is to demonstrate sound lighting retrofit solutions in a selection of representative, typical Case Studies. The selection of Case Studies will be based on a general building stock analysis, including the distribution of building typology in relation to lighting retrofit potential. These case studies will deliver proven and robust evidence of achievable savings and show integrated retrofit strategies. Measurements and assessments will include monitoring of energy savings, lighting quality and operational costs. In addition, Subtask D will provide updated information from an analysis of previously documented Case Studies in the literature and on websites. The work of Subtask D will be structured into to six projects:

D.1 Building stock/typology
D.2 State-of-the-art
D.3 Assessment and monitoring procedure
D.4 Case study assessment
D.5 Overall conclusions, lessons learned
D.6 Case study book / e-documentation

Joint Working Group "Lighting Retrofit Adviser" (LRA)

All Subtasks will provide major parts of their results, as input to this joint activity. Based on these results, the joint working group will develop an electronic interactive source book (Lighting Retrofit Adviser). A central data base will include all task results and will allow the users to obtain extensive information, according to their individual focus of interest: design inspirations, design advice, decision tools and design tools. Thus, the user will be able to increase quickly and reliably his knowledge in the respective field of interest. Users will have the choice of analysing retrofit (design) scenarios themself and/or using the pool of experience gained in the case studies projects (electronic version of case study book) to access information on energy saving potentials and economic approaches. The Lighting Retrofit Adviser will address specific needs of different target groups and audiences. The joint working group will be structured into 4 project tasks:

JWG.1. Architecture and software design
JWG.2. Concept evaluation and proof
JWG.3. Implementation
JWG.4. Validation, quality assurance and national adaptions