Design Methodology for Avoiding Condensation in Automotive Head Lamps

One of the important aspects to consider at the design stage is the condensation of water vapor inside the lighting system, under specific weather conditions of temperature and humidity, which may compromise the device functionality. Condensation of water vapor is an issue affecting functional and aesthetics of Head Lamp. The current paper analyses the process of water vapor condensation inside an automotive LED head lamp. This paper also discusses the design methodology to avoid condensation under certain conditions. Design methodology includes design considerations for better air movement for thermal management, material selection, ease of moisture exchange, breather or vent selection, Vent placement. Additionally, this paper would also discuss about effective use of simulations tools, test methods and assembly process guidelines to avoid impact due to condensation. This paper would consist of one example with application of above methodology, its test and field results.