| Answer | Crossword Clue |
|---|---|
| LUMEN | Unit of light flow. |
| LUMEN | Unit for measuring flow of light |
| LUMENS | Units of light flow |
| LUMENS | Units of light flow. |
| LUMEN | Measure of flow of light |
| louvers | finned or vaned device for controlling a flow of air or the radiation of light |
