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Underlighting can make a space feel dim and unsafe, while overlighting wastes energy and increases glare. For contractors, facility managers, and building owners alike, having a quick way to estimate how many lumens a space needs is useful during early planning. A common rule of thumb is to combine square footage with target foot-candle levels to estimate total light output for a room, warehouse, or office. This guide explains the method, provides practical foot-candle ranges, and shows how to t …