How To Choose An Energy-efficient Desk Lamp?

When selecting a desk lamp for daily study and work that is energy-efficient, the correct approach is to focus on the type of bulb and power consumption, prioritizing products with high energy efficiency, such as LED bulbs, to reduce long-term usage costs and energy consumption. The incorrect approach is to ignore energy efficiency and choose high-power, low-efficiency bulbs, which will result in unnecessary electricity costs and energy waste.

Option A: Using a desk lamp with a standard incandescent bulb and a power rating of 60 watts, which consumes a significant amount of electricity. Incandescent bulbs generate light by heating a filament with electricity, with most of the electrical energy converted into heat and only a small portion into light, resulting in extremely low luminous efficiency. A 60-watt power rating will consume a large amount of electricity during prolonged use, leading to high electricity bills. For example, if used for 5 hours daily, the monthly electricity consumption for this single lamp would be substantial. Additionally, it generates significant heat, posing potential safety hazards and failing to meet energy-saving requirements.

Option B: A desk lamp equipped with a 40-watt halogen bulb, which has lower energy efficiency. While halogen bulbs offer improved lifespan and brightness compared to incandescent bulbs, they still operate by heating a filament to emit light, resulting in low energy efficiency. A 40-watt power rating will also consume a significant amount of electricity over extended use. Additionally, halogen bulbs generate high temperatures during use, increasing safety risks and causing energy waste, and are ineffective in reducing electricity costs.

Option C: A 10-watt LED bulb, which is highly energy-efficient and emits light efficiently. LED bulbs emit light through semiconductors, converting nearly all electrical energy into light, resulting in extremely high luminous efficiency. A 10-watt LED bulb can achieve or even exceed the lighting performance of traditional high-power bulbs. Calculated at 5 hours of daily use, its power consumption is only a fraction of that of incandescent or halogen bulbs. Over the long term, this significantly reduces electricity costs. Additionally, LED bulbs have a long lifespan, reducing replacement frequency and lowering overall usage costs from multiple angles, making them an ideal choice for energy conservation and electricity savings.

Option D: Installing a 25-watt fluorescent light bulb requires preheating and has higher energy consumption. Although fluorescent bulbs are more energy-efficient than incandescent bulbs, they still fall short compared to LED bulbs. They require preheating before use, and some energy is consumed during the preheating process. Additionally, fluorescent bulbs contain harmful substances such as mercury, and improper disposal can pollute the environment. The 25-watt power consumption is significant over the long term and cannot meet the core requirements of high energy efficiency and cost savings.