To charge a desk lamp with USB directly, first verify if the lamp has a built-in USB port or supports USB-C connectivity. If equipped, connect a compatible USB cable to the lamp and a power source such as a USB wall adapter, laptop, or smartphone charger. Ensure the cable and power source match the lamp’s voltage and current requirements. For lamps without native USB ports, use a USB-to-USB adapter or a power bank with sufficient wattage. Always check the manufacturer’s guidelines to confirm compatibility and avoid damage.

The ability to charge desk lamps via USB stems from advancements in portable electronics and standardized power protocols. Modern desk lamps increasingly integrate USB-C or USB-A ports to align with universal charging trends, reducing reliance on proprietary adapters. According to a 2023 report by the Consumer Electronics Association, 68% of new desk lamps feature USB-C ports, up from 42% in 2020, reflecting market shifts toward interoperability. USB Power Delivery (PD) technology enables fast charging, supporting lamps with higher power demands. For example, a 2022 study by the USB-IF found that 90% of USB-C devices now support PD, allowing devices to charge at up to 100W. Direct USB charging also enhances portability and cost savings, as users repurpose existing cables and power banks. However, safety is critical: mismatched voltage (e.g., 5V USB vs. 12V lamp) can cause overheating. The U.S. Consumer Product Safety Commission advises using certified chargers with overcurrent protection to mitigate risks. In summary, USB direct charging simplifies lamp operation, aligns with industry standards, and promotes energy efficiency, provided users adhere to compatibility and safety guidelines.