How many foot candles of light needed for a greenhouse?

A greenhouse typically requires between 10,000 to 20,000 foot candles of light for optimal plant growth, depending on the type of plants being cultivated. For seedling propagation and leafy greens, around 10,000 foot candles may suffice, while fruiting plants often need closer to 20,000 foot candles. It's essential to monitor light levels and adjust as needed to ensure healthy plant development.