Lighting may be considered as fulfilling two purposes: to enable an activity to be pursued and to provide amenity or enjoyment. If the activity is part of a productive process then the value of lighting should be capable of objective financial appraisal; amenity is a matter of value judgement. The paper describes 'cost-in-use' and 'present value' methods of financial appraisal and illustrates their use in determining the productive value of lighting. Examples of subjective evaluations are also given. Quantity of light alone will never redeem poor design and the best value will only be obtained if the needs of the users are met without undue energy demands.
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