Calculating the right amount of lighting for a space involves understanding the room's purpose, size, and natural light availability. Use the formula: Room Area (sq. ft) × Recommended Foot-Candles. Foot-candles vary by space type: 10-20 for living rooms, 30-50 for kitchens, and 50-100 for task areas. Multiply lumens per bulb by the number of bulbs to meet the total requirement. Consider layering light—ambient, task, and accent—for functionality and aesthetics. Test the setup to ensure balanced illumination.