If you are installing new shop lights or positioning a workbench in your shop, a simple test can help you find the position for best illumination. Hold a pencil or dowel vertically, then check for shadows. Reposition your set-up to reduce shadows as needed. If you have strong shadows on one or more sides, consider buying more lights.
Underlayment should be nailed to the subfloor plywood and not into the the floor joists below to make the underlayment and subfloor plywood work together uniformly.