In general there is little knowledge regarding artificial lighting in museum surroundings for the professional designer. Exhibition designers are mostly dependent on what is supplied by the lighting industry and, above all, what has previously been purchased by the museum. Knowledge of lighting can be obtained by looking around in other museums and at exhibition. But one will soon find out that the situation is often miserable. The architect who designs a new museum or reshapes an existing building to make a museum bears the primary responsibility for the proper intensity of light. There are various outstanding examples of museum architecture in which architects have shown full awareness of the importance of using and/or excluding daylight. All the considerations concerning preservation and presentation, and the inherent contradistinction between no light versus too much light are determined by establishing values. It is these values, ascertained by conservation, which is probably by far the most important consideration regarding the presentation. While it can be admitted that any use will cause a certain amount of damage, today's technological developments offer the means to pursue optimal results.