The first thing you should do is determine the square footage of the area you’re looking to illuminate. Do this by multiplying the length times the width. Then determine the number of foot candles by room type. For reference, there are usually charts online with this information. Once you have this number, multiply it by your square footage, and that’s the number of lumens you’ll need. As an example, if a space is 100 square feet and needs 30-40 foot candles, you’ll need 3,000-4,000 lumens.