Query: more so than downsizing one’s car, or being vigilant about turning off light bulbs, and certainly more than quitting showering.

Relevant passages:
Headlamp <=SEP=> A headlamp is a lamp attached to the front of a vehicle to light the road ahead . While it is common for the term headlight to be used interchangeably in informal discussion , headlamp is the term for the device itself , while headlight properly refers to the beam of light produced and distributed by the device .   Headlamp performance has steadily improved throughout the automobile age , spurred by the great disparity between daytime and nighttime traffic fatalities : the US National Highway Traffic Safety Administration states that nearly half of all traffic-related fatalities occur in the dark , despite only 25 % of traffic travelling during darkness .   Other vehicles , such as trains and aircraft , are required to have headlamps . Bicycle headlamps are often used on bicycles , and are required in some jurisdictions . They can be powered by a battery or a small generator mechanically integrated into the workings of the bicycles .

LED lamp <=SEP=> An LED lamp is a light-emitting diode ( LED ) product which is assembled into a lamp ( or light bulb ) for use in lighting fixtures . LED lamps have a lifespan and electrical efficiency which are several times greater than incandescent lamps , and are significantly more efficient than most fluorescent lamps , with some chips able to emit more than 300 lumens per watt ( as claimed by Cree and some other LED manufacturers ) . The LED lamp market is projected to grow by more than twelve-fold over the next decade , from $ 2 billion in the beginning of 2014 to $ 25 billion in 2023 , a compound annual growth rate ( CAGR ) of 25 % . As of 2016 , LEDs use only about 10 % of the energy an incandescent lamp requires .   Like incandescent lamps and unlike most fluorescent lamps ( e.g. tubes and compact fluorescent lamps or CFLs ) , LEDs come to full brightness without need for a warm-up time ; the life of fluorescent lighting is also reduced by frequent switching on and off . The initial cost of LED is usually higher . Degradation of LED dye and packaging materials reduces light output to some extent over time .   Some LED lamps are made to be a directly compatible drop-in replacement for incandescent or fluorescent lamps . An LED lamp packaging may show the lumen output , power consumption in watts , color temperature in kelvins or description ( e.g. `` warm white '' ) , operating temperature range , and sometimes the equivalent wattage of an incandescent lamp of similar luminous output .   Most LEDs do not emit light in all directions , and their directional characteristics affect the design of lamps , although omnidirectional lamps which radiate light over a 360 ° angle are becoming more common . The light output of single LED is less than that of incandescent and compact fluorescent lamps ; in most applications multiple LEDs are used to form a lamp , although high-power versions ( see below ) are becoming available .   LED chips require controlled direct current ( DC ) electrical power and an appropriate circuit as an LED driver is required to convert the alternating current from the power supply to the regulated voltage direct current used by the LEDs . LEDs are adversely affected by high temperature , so LED lamps typically include heat dissipation elements such as heat sinks and cooling fins .   LED drivers are the essential components of LED lamps or luminaries . A good LED driver can guarantee a long life for an LED system and provide additional features such as dimming and control . The LED drivers can be put inside lamp or luminaire , which is called a built-in type , or be put outside , which is called an independent type . According to different applications , different types of LED drivers need to be applied , for example an outdoor driver for street light , an indoor point driver for a down light , and an indoor linear driver for a panel light .

Series and parallel circuits <=SEP=> Components of an electrical circuit or electronic circuit can be connected in many different ways . The two simplest of these are called series and parallel and occur frequently . Components connected in series are connected along a single path , so the same current flows through all of the components . Components connected in parallel are connected , so the same voltage is applied to each component .   A circuit composed solely of components connected in series is known as a series circuit ; likewise , one connected completely in parallel is known as a parallel circuit .   In a series circuit , the current through each of the components is the same , and the voltage across the circuit is the sum of the voltages across each component . In a parallel circuit , the voltage across each of the components is the same , and the total current is the sum of the currents through each component .   Consider a very simple circuit consisting of four light bulbs and one 6 V battery . If a wire joins the battery to one bulb , to the next bulb , to the next bulb , to the next bulb , then back to the battery , in one continuous loop , the bulbs are said to be in series . If each bulb is wired to the battery in a separate loop , the bulbs are said to be in parallel . If the four light bulbs are connected in series , there is same current through all of them , and the voltage drop is 1.5 V across each bulb , which may not be sufficient to make them glow . If the light bulbs are connected in parallel , the currents through the light bulbs combine to form the current in the battery , while the voltage drop is across each bulb and they all glow .   In a series circuit , every device must function for the circuit to be complete . One bulb burning out in a series circuit breaks the circuit . In parallel circuits , each light has its own circuit , so all but one light could be burned out , and the last one will still function .

Phase-out of incandescent light bulbs <=SEP=> Governments around the world have passed measures to phase out incandescent light bulbs for general lighting in favor of more energy-efficient lighting alternatives . Phase-out regulations effectively ban the manufacture , importation or sale of incandescent light bulbs for general lighting . The regulations would allow sale of future versions of incandescent bulbs if they are sufficiently energy efficient .   Brazil and Venezuela started the controversial phase-out in 2005 , and the European Union , Switzerland , and Australia started to phase them out in 2009 . Likewise , other nations are implementing new energy standards or have scheduled phase-outs : Argentina , and Russia in 2012 , and the United States , Canada , Mexico , Malaysia and South Korea in 2014 .   Objections to replacement of incandescent lamps for general lighting mainly include the higher purchasing cost of alternative light bulbs . To mitigate the effects of these concerns , various programs have been put in place ranging from subsidies for lamps to improved standards for measurement of performance and for labelling products . Manufacturers develop fluorescent lamps with reduced mercury content compared to original designs , and recycling programs are intended to prevent mercury release . New lamp types offer improved starting characteristics , and dimmable types are available .

Efficient energy use <=SEP=> Efficient energy use , sometimes simply called energy efficiency , is the goal to reduce the amount of energy required to provide products and services . For example , insulating a home allows a building to use less heating and cooling energy to achieve and maintain a comfortable temperature . Installing fluorescent lights , LED lights or natural skylights reduces the amount of energy required to attain the same level of illumination compared with using traditional incandescent light bulbs . Improvements in energy efficiency are generally achieved by adopting a more efficient technology or production process or by application of commonly accepted methods to reduce energy losses .   There are many motivations to improve energy efficiency . Reducing energy use reduces energy costs and may result in a financial cost saving to consumers if the energy savings offset any additional costs of implementing an energy efficient technology . Reducing energy use is also seen as a solution to the problem of reducing greenhouse gas emissions . According to the International Energy Agency , improved energy efficiency in buildings , industrial processes and transportation could reduce the world 's energy needs in 2050 by one third , and help control global emissions of greenhouse gases .   Energy efficiency and renewable energy are said to be the twin pillars of sustainable energy policy and are high priorities in the sustainable energy hierarchy . In many countries energy efficiency is also seen to have a national security benefit because it can be used to reduce the level of energy imports from foreign countries and may slow down the rate at which domestic energy resources are depleted .