Normalized Difference Vegetation Index (NDVI) is an important remote measurement in agriculture as it has high correlation with plant growth and yield result. NDVI used together with other industrial greenhouse sensors would provide more detailed information on which greenhouse operation individual parameter or parameter group change (temperature, natural light level, air humidity, irrigation cycle. etc.) have greater impact on plant wellbeing and yield. NDVI or other remote contactless measurement methods, like chlorophyll Fluorescence and Multispectral imaging could provide an instant feedback on current tomato plant state and wellbeing. In this paper, we present our experimental setup and corresponding approach on long term NDVI sensor setup and data capturing in industrial greenhouse environment which has artificial light component along with the natural light. In details we discuss differences in NDVI calculation in environments with different kind of artificial and natural lighting combinations.