Light in this context describes the weight of something compared to other things that can be involved in a situation. "Something light" is a term that can be used to illustrate anything small in quantity or by people's acceptable standards of measure. It might be insignificant to you and the people around you are not helping matters. But the good news is that those trivial things are big enough for God to open up a great channel that other people can be blessed from. Remember the widow that Elisha ministered to (2 Kings 4:1-7)? She had a pot of oil, but her family was saved from slavery by it. Nothing or void is enough space for God to work and fill if you'll let Him. Sometimes, people won't see problems and solutions the way you do because they are looking at it from the top and high places, and right from where you are (sometimes beneath the pyramid or a chain of command), you can spot the crack. Never underestimate or despise the power and grace you...
The perception of Truth may vary, but the core remains valid and LIGHT sees TRUTH...