The exposure limit value of illumination is the maximum level of light exposure that is considered safe for human health and well-being. This value is typically measured in lux (lx) or foot-candles (fc) and can vary depending on the specific circumstances and environment. In general, exposure to high levels of illumination for extended periods of time can cause eye strain, headaches, and other health issues. It is important to adhere to recommended exposure limit values to ensure a safe and comfortable working or living environment.