If your HP printer is printing very lightly, it could be due to several reasons. First, check the ink or toner levels to ensure they are not low or depleted. Next, inspect the print settings to ensure the appropriate quality and density options are selected. Additionally, check for any clogged print heads or dirty printer components, which can affect print quality. If using ink cartridges, consider shaking them gently to redistribute the ink. If the issue persists, run the printer's cleaning utility or align the printheads to improve print quality. For additional support, get in touch with HP support.