This thesis studies how to design a light to a target group based on different theories and methods. The aim has been to investigate what factors are needed to design a good lamp based on theories developed by Poul Henningsen. The problem definition for this study is as follows: How can you use the ACD methods and design process to design a dining table lamp based on Poul Henningsen's theories about light?In order to answer the problem definition, a choice was made to work with the theoretical field of User Centered Design. The study is based on empirical evidence of light and methods that will investigate and analyze the specific needs of a target group in regard to a dining table lamp. Using a design process consisting of idea generation, conceptualizing and prototyping, a lamp that meets both the needs of the target group and the requirements of Poul Henningsen has been designed. The result of this was the development of a dining table lamp that has several different adjustment options physically and technically and casts theoretically correct shadows.This study shows how little empiric evidence that currently exist about light and its use. Therefore, there is ample opportunity to do more research on this topic. Additionally, this task opens up the possibility of designing new lamps based on clarified guidelines.