Energy-efficient lighting typically uses less energy to produce the same amount of light, leading to reduced energy consumption and lower electricity bills. It also helps reduce carbon emissions by consuming less electricity generated from fossil fuels.

LEDs are considered the most energy-efficient lighting technology, consuming significantly less energy compared to traditional incandescent bulbs or CFLs. They also have a much longer lifespan, lasting up to 50,000 hours or more.

Traditional lighting practices, particularly those relying on fossil fuel-generated electricity, contribute to greenhouse gas emissions. The burning of fossil fuels releases carbon dioxide and other greenhouse gases into the atmosphere, leading to climate change and global warming.

While the color of light can impact the perceived brightness or ambiance, it does not directly affect the energy efficiency of a lighting system. The energy efficiency is primarily determined by the type of light source, lighting design, usage patterns, and the use of occupancy sensors.

Luminous efficacy is the measure of how efficiently a light source converts electrical energy into visible light. It is expressed in lumens per watt (lm/W) and indicates the amount of light output for a given amount of energy consumed.

Using higher wattage bulbs is not an energy-efficient practice. Instead, it is recommended to use energy-efficient light sources, such as LEDs, and control the amount of light through dimming or by using lower wattage bulbs.

Occupancy sensors detect movement and presence in a space and automatically turn lights on or off accordingly. This helps reduce energy consumption by ensuring that lights are only used when needed, leading to significant energy savings.

Leaving lights on 24/7 is not a sustainable lighting practice as it wastes energy and increases electricity consumption. Instead, it is recommended to use motion sensors or timers to ensure that lights are only used when needed.

Color rendering index (CRI) is a measure of how well a light source reproduces the colors of objects compared to a natural light source. It is expressed on a scale of 0 to 100, with higher values indicating better color rendering.

Energy-efficient lighting in commercial buildings leads to reduced energy consumption and lower electricity bills. It also improves employee productivity and occupant comfort by providing better quality lighting. However, it does not increase carbon emissions; instead, it helps reduce them by consuming less energy.

Beam angle is the angle at which light is emitted from a light source. It determines the spread of light and is an important factor in lighting design and applications.

Using higher wattage bulbs is not an energy-efficient practice for streetlights. Instead, it is recommended to use energy-efficient LED streetlights and control the amount of light through dimming or by using lower wattage bulbs.

Sustainable lighting practices aim to reduce energy consumption and carbon emissions associated with lighting. This is achieved by using energy-efficient light sources, optimizing lighting design, and implementing control strategies to ensure that lights are only used when needed.

Incandescent bulbs are not considered energy-efficient lighting technology as they consume significantly more energy compared to other options like CFLs and LEDs. They produce light by heating a filament, which is an inefficient process.

Light output ratio is the ratio of the light output of a light source to the total power it consumes. It is expressed in lumens per watt (lm/W) and is a measure of the energy efficiency of a light source.