Cree LED Energy Savings Calculator

For reflector bulbs like an R20 or an MR16, Lux is more important than Lumens. Lux is a measurement of light on a surface. Reflector bulbs are available with different beam spreads. A bulb with the same wattage and a narrower beam will have a higher Lux. If you are lighting an object from a distance you may be able to choose a lower wattage reflector bulb with a narrow beam to save money on electricity.

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Westside recommends that you only use the manufacture recommend trims, designed specifically for the housing. 

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An "Air-Tight" or  "Air-Tite"  housing  is sealed to stop air from escaping through the recessed housing cut-out into the ceiling or attic. Many states currently require the use of Air-Tight housings in order to meet energy conservation codes, check local codes for more information.

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Line-Voltage Housings do Not require any transformer, they can be directly wired into your home's 110V/120V electrical system. Line-Voltage Housing are more commonly used because of their lower cost due to not needing a transformer, and also offer more versatility allowing the use of incandescent or halogen lamps.

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For electrical discharge lamps, this is the voltage measured across the discharge when the lamp is operating. It is governed by the contents of the chamber and is somewhat independent of the ballast and other external factors.

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