More and more tomato growers both in the Netherlands and abroad are opting to use diffuse glass in new greenhouses. A literature review was carried out to examine the effect of a diffuse greenhouse cover or a greenhouse cover with a different light spectrum on pollination and fruit setting in tomatoes. Information was also collected on the influence of the light spectrum on insects and bumblebees. This desk study was carried out on the request of Koppert Biological Systems. Unfortunately, the amount of information found on the subject proved to be limited.