— J —

Joist
Any of the wood, steel, or concrete beams set parallel from wall to wall or across or abutting girders to support a floor or ceiling.


— K —

Kelvin 
Kelvin is a unit of measurement for temperature used to describe the color of light. A traditional incandescent light bulb is said to have a kelvin temperature of 2700 which is a warm yellowish light. (more)

kVAR device
A Power factor correction device - also called “black box" - is installed in a home's electrical system to help control power factor and reduce kVAR-hour usage. If Ameren Missouri is your electric supplier, Ameren Missouri bills by kilowatt-hour, not kVAR-hour usage. Therefore, these devices do not help Ameren Missouri customers reduce their energy bill. However, if your utility company bills you by kVAR-hour usage, these devices could possibly save you money on your electric bill. (more)

kW
kW stands for kilowatt or 1,000 watts. It is a measure of the rate of electric use.

kWh
kWh stands for kilowatthour or 1,000 watts/hour. It is a measure of the total usage of electricity.


— L —

Label, EnergyGuide
If you’ve shopped for appliances, you’ve probably seen the bright yellow EnergyGuide label. Recently revised, it is now easier to find out how much energy an appliance uses. (more)

Landfills
Place for trash and garbage disposal where the waste is buried between layers of earth.

Landscaping lighting
Solar landscape lighting is virtually maintenance free, easy to install, and uses the power of the sun to light your garden or walkway. (more)

LCD 
Liquid crystal display: a digital display which uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches, etc.

LCD TV
ENERGY STAR® qualified televisions use about 40% less energy than standard units. You can find the ENERGY STAR qualifying logo on everything from standard TVs, Plasma TVs, LCD, and HD-ready TVs. (more)

Learning thermostat
Easily maintain the desired comfort level in your home with a learning thermostat that remembers your temperature adjustments and programs itself to build a personalized schedule. (more)

LED
A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are used increasingly for lighting. (more)

LED bulb recycling
According to ENERGY STAR®, LED bulbs or light emitting diode do not need to be recycled in the same manner as computers, electronics or CFLs since they do not contain mercury. The LED bulbs can be disposed of like traditional incandescent bulbs; however, many LED bulb components can be recycled. (more)

LED, dimmable
The use of LEDs can save up to 75% over traditional incandescent bulbs. When making your dimmable LED purchase, be sure the packaging says dimmable as some LEDs are not dimmable. (more)

LED dock lighting
LED loading dock lighting may increase your light levels while potentially reducing the energy usage of your existing dock lighting. And with LED lamp life up to 50,000 hours, maintenance costs should decrease as well. (more)

LED recycling
According to ENERGY STAR®, LED bulbs or light emitting diode do not need to be recycled in the same manner as computers, electronics or CFLs since they do not contain mercury. The LED bulbs can be disposed of like traditional incandescent bulbs; however, many LED bulb components can be recycled. (more)

LEED
Leadership in Energy and Environmental Design. A system to categorize the level of environmentally sustainable construction in sustainable buildings.

Light bulb, incandescent
Incandescent lighting has traditionally delivered about 85% of household lighting. Making improvements to your lighting is one of the fastest ways to cut your energy bills. (more)

Light fixture
A fixed electrical device used in securing a light or lamp in a business or residential application. (more)

Light pipes
Light tubes or pipes are usually installed in the roof of a home, or the outside wall of a building, to allow sunlight to reflect through the opening. A reflective material inside the tube directs the sunlight down the tube and with the help of a diffuser, distributes it throughout your home or building. Some light tubes have directional collectors, also called reflectors, which assist in collecting additional directional light down the tube. (more)

Light switch insulation
A type of thin insulation used to seal out drafts. Specific sizes can be purchased to match the particular type of wall switch plate you are trying to insulate. To install this type of insulation, you will need to remove the light switch cover. (more)

Light tubes
Light tubes or pipes are usually installed in the roof of a home, or the outside wall of a building, to allow sunlight to reflect through the opening. A reflective material inside the tube directs the sunlight down the tube and with the help of a diffuser, distributes it throughout your home or building. Some light tubes have directional collectors, also called reflectors, which assist in collecting additional directional light down the tube. (more)

Lighting label
Making improvements to your lighting is one of the fastest ways to reduce your energy bills. When you're shopping for light bulbs, compare lumens to be sure you're getting the amount of light or level of brightness you want. (more)

Lighting - Residential savings tips
According to the Department of Energy (DOE), the average cost for residential lighting may be as much as 6% of your energy bill. Bulb type, wattage, lack of lighting timers, motion sensors, outside lighting and lighting habits can all play a role in wasting energy and costing you money. For ways to save, see our residential savings tips. (more)

Lighting timer
A timer can be used on appliances, lighting, and electronics.  Used wisely, it can also be an energy saver and safety unit. (more)

Liquified natural gas vehicle (LNG vehicle)
A natural gas vehicle, or NGV, is an alternative fuel vehicle that uses compressed natural gas (CNG) as a clean alternative to other automobile fuels. (more)

Lithium ion battery
A lithium ion battery, sometime called a Li-ion battery or a LIB, is a rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge, and back when charging. Lithium ion batteries are commonly used in electronics. (more)

Living roof
A green roof is a residential or commercial building with vegetation growing on part or all of the rooftop. Green roofs may also be known as living roofs and are designed to be environmentally and aesthetically pleasing. (more)

Living walls
Living walls (also called green walls, green facades, bio walls or vertical vegetation walls) have vegetation growing directly onto a building or home, or on a separate structure that can be freestanding or attached to a wall. Today living walls are re-entering the spotlight as an environmentally friendly way to reduce energy costs. (more)

Loading dock seal/shelter
On a typical dock door, a four inch bumper absorbs the blow when semi-trucks back into the docking area. When the dock door is open during loading and standby, a gap between the trucks and door allows cold air into the building and siphons warm air out. Installing loading-dock seals (also known as shelters) can help control heating costs. (more)

Low bay lighting
Lighting that is installed at a height of 18 feet or lower. (more)

Low-flow shower head 
A low flow shower head restricts the gallons per minute (GPM), reducing the amount of hot water used during a shower which can lower your hot water energy costs. (more)

Lumens
Making improvements to your lighting is one of the fastest ways to reduce your energy bills. When you're shopping for light bulbs, compare lumens to be sure you're getting the amount of light or level of brightness you want. (more)
Learning Center - Terms J, K, L
 
 
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