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Course Title
100 Home
101 Introduction
102 FAQ Page
103 Course Catalog
104 Green World
105 Demand & Supply
106 Conservation Careers
107 Solar Careers
108 Wind Turbine Careers
109 Entrepreneurs
110 Employee or Employer?
200 Demand Management
201 Summary
202 Residential Energy Profile
203 Ten Conservation Rules
204 HVAC System
205 Kitchen Appliances
206 Water Heater
207 Lighting
208 Laundry Appliances
209 Calculating Savings
300 Renewable Technology
301 Solar Energy
302 Solar Collectors
303 Solar Water Heating
304 Stirling Engines
305 Basic AC-DC Electronics
306 Silicon Solar Panels
307 Thin Film Solar Panels
308 Wind Turbines
309 Inverters
310 Grid Tied and Off Grid
311 Solar Site Survey
312 Solar Site Diagram
313 Sun Path Chart
314 Site Survey Worksheet
315 Wind Turbine Site Survey
316 Wind Turbine Worksheet
400 Solar Thermal Design
401 Solar Heat Overview
402 System Configuration
403 Site Survey
404 SRCC Compliance
405 System Specification
406 Bill of Materials
407 System Installation
408 Solar Heat Incentives
409 Document Package
410 Future Products
500 Solar PV Design
501 Solar PV Overview
502 System Configuration
503 Site Survey
504 Grid Tied & Off Grid
505 System Specification
506 Bill of Materials
507 System Installation
508 Solar PV Incentives
509 Document Package
510 Future Products
600 Wind Turbine Design
601 Wind Turbine Overview
602 System Configuration
603 Site Survey
604 Grid Tied and Off Grid
605 System Specification
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Green Collar Careers - Lighting

Low cost incandescent bulbs were a revolutionary product that over 100 years later hasnít changed much. Nearly 90% of the energy required to light an incandescent bulb is turned into heat rather then light so they will add significantly to the load on the air conditioner during the summer season. Heat generated from an incandescent costs more then twice as much as the heat from a heat pump so its not a very cost effective heater. The only positive point about an incandescent bulb is they are the least expensive to purchase.

Halogen lighting is slightly more efficient then an incandescent by about 15%. From practical experience they have about the same life as an incandescent.

Compact Florescent Lights (CFL) require ľ the power for the same amount of light from an incandescent. Not all standard fixtures can accept a CFL although generally at least 80% of the fixtures in a typical home can. CFLís do not work as well in colder climates so they may not be very good for outdoor lighting. CFLís generally cost about 4 times that of an incandescent which is probably the main reason most people still use incandescent lights. Most CFL manufacturers may claim 10 times the life over an incandescent, but thatís only in specific laboratory conditions designed to optimize the life of the CFL. In practical application, 4-5 times the life is more realistic making the CFL cost effective based on replacement cost alone.  The one drawback to CFL's is they don't work very well on dimmer circuits.  When installed on a dimmer equipped circuit they may take a few seconds to "fire up" even with the switch turned up all the way.

Standard Florescent Tube (SFT) fixtures are still the most cost effective of the lighting methods however they require special fixtures and lack the aesthetic appeal for most homeowners. Thatís why they are mostly only used in garages and utility rooms. SFTís also are prone to a flicker that some people find annoying. This flicker has been resolved with CFL and some of the higher priced SFTís.

Light Emitting Diode (LED) technology will be the next generation of lighting but isnít yet ready for cost effective use. LEDís are about 95% efficient, with nearly all the losses in the voltage conversion circuits that are self contained. The LEDís themselves will last 20+ years, however the voltage conversion circuits will only have a life of about 10 years at this point. More of a novelty then practical, its expected that cost effective versions will be available within 5 years.

Understanding the different lighting options it should be clear that the CFL offers the best solution at this time. If the homeowner is using exclusively incandescent lighting, the following gives a typical savings potential in a moderate climate by switching to CFL.

Energy reduction for CFL vrs Incandescent:

70% reduction for lighting energy + 10% reduction for heating energy = 80%
Applied to 80% of the home light fixtures; 80% * 80% = 64%

Average portion of power consumed for lighting from Chart 202 = 8.8%
Reduction of power consumed for lighting; 8.8 * .64 = 5.6%

CFL lighting also provides a sales and installation opportunity for the Home Energy Auditor.  Keeping a range of bulbs in your inventory and a ladder for installing them can be profitable.

LED's seem to offer an appealing attraction to the gadget-conscious.  It would be worthwhile to have a few LED spotlight bulbs.  LED's "shine" in fixtures that are high up and shine down as these are the most difficult bulbs to replace and the ultra long life of an LED will last for up to 20 years.


LED floodlight
Compact Florescent Light Wholesale