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Factsheet: Light Bulb Buyers Guide

11Mar

Factsheet: Light Bulb Buyers Guide

Category: Lighting

Date: 11/03/2016

Buying a light bulb? Information for consumers

Choosing the right lighting

Choosing light bulb replacements for your home can be confusing. You may have noticed that the choices of light bulbs available for your home has expanded and some of the older options you once relied on have disappeared. With lighting taking between 8 to 15 per cent of the average household electricity spend, there are lots of options to reduce the amount of energy used for lighting while still providing the right light for your needs.

The information in this guide will help you choose bulbs that are fit for purpose, last longer and are cheaper to run.

The key things to remember when choosing bulbs are:

1. Think lumens (the amount of light output), not watts
2. Consider lifetime costs, not just the purchase price
3. Get the mood of your light right – consider colour temperature
4. Decide what type of light you need – general or task specific.

Typical household lighting

Cross section of a home identifying the various types of lighting in the home, including ceiling lights, reading lamps, spot lights, task lights (example shown is above the stove), and floor lamps.

1. Think lumens, not watts

We used to purchase old fashioned incandescent bulbs by the amount of power (or watts) they used. With the energy-efficient new technologies now available light bulbs now produce the same amount of light using far less power. It no longer makes sense to shop for watts. Using ‘lumens’ is now the way to choose the light you need.

Lumens give a measure of the amount of light produced by a light bulb. An old-fashioned incandescent light bulb (no longer available) produced 700 lumens and used 60W of power, whereas a new energy efficient LED uses only 10W. That’s an energy saving of around $16 per year for each bulb (when used 3 hours per day).

While you can source the lumens (light!) you need from a range of technologies, halogen lights will be less efficient and cost more to run than CFL (compact fluorescent lamp) and LED (light emitting diode) equivalent options.

 

LED Light
Output
(Lumens)

Power
(Watts)

 

Old style
incand-
escent

Mains
voltage
halogen

CFL

LED

Light bulb with very low light output
250

25

18

4-6

3-4

Light bulb with low light output
500

40

28

7-9

5-8

Light bulb with moderate light output
800

60

42

11-14

8-12

Light bulb with high light output
1100

75

52

14-17

11-17

Light bulb with very high light output
1500

100

70

19-23

15-23

Bulb light output is measured in lumens. The table shows the required lumen output of an LED, when used to replace old style incandescent and halogen light bulbs. Also shown are the typical wattages of bulbs.

 

2. Consider lifetime cost

Choose the light bulb that will cost you the least in the long run.

Two of the main differences between lighting technologies are lifespan and efficiency. For example, while a halogen bulb is cheaper to buy than an LED, a good quality LED lasts 5-10 times longer and consumes a quarter of the energy.

The table below shows the total lifetime cost over 10 years for a 800 lumen LED bulb, compared with CFL and halogen alternatives.

Cross section of a home identifying the various types of lighting in the home, including ceiling lights, reading lamps, spot lights, task lights (example shown is above the stove), and floor lamps.

A 10W LED bulb would cost $39 in total to buy and run over 10 years. Over this time, five 42W halogen bulbs would need to be used at a total cost of $148, or two 12W CFL bulbs would be used, at a total cost of $48. These figures are based on lifetimes of 6000 hours for CFL and 2000 hours for halogen; an LED price of $10, CFL price of $6, and halogen price of $3. The electricity rate is 28.55¢ per kilowatt-hour (kWh).

 

3. Get the mood of your light right

A Cool White bulb is used on the left and Warm White bulb on the right.
A hall table and a photograph hanging on the wall are lit by a light bulb that emits what is described as cool white light. This light is whiter in colour than the image to the right.A hall table and a photograph hanging on the wall are lit by a light bulb that emits what is described as warm white light. This light is yellower in colour than the image to the left.

 

CFL and LED light bulbs are available in a range of colour temperatures, allowing you to customise the mood of your space.

Warm White is a soft, warm light similar to incandescent and halogen bulbs, suitable for living rooms and bedrooms.

Cool White is a neutral light suited to studies and kitchens, and for task-based applications such as kitchen benches, garages and workshops.

Daylight is a colder light similar to midday daylighting conditions. It can appear harsh, unrelaxed and even sterile, but may be good for bathrooms and laundries.

4. Lighting your home

Combination of general and accent lighting.
A pendant sphere hanging from the ceiling provides general lighting within the dining room. Directional lighting emphasises the photographs on the wall.

Most rooms need general, ambient lighting complemented by task-specific accent lighting.

Ambient lighting radiates overall at a comfortable brightness level. Have a central ambient light source in all rooms.

In addition, have task lighting that can be switched on and off according to your preferences and needs. For example, lamps for reading or sewing, and extra lighting over kitchen benches and bathroom mirrors.

Accent lighting may be useful to emphasise paintings, house plants, or collectables. Directed downlights are ideal for this purpose.

 

5. How light bulbs compare

 

 LED (light emitting diode)

CFL (compact fluorescent lamp)

Halogen

Circular and linear fluorescent

Typical omnidirectional light bulb and price

 

A hemispherical LED with Edison screw cap
$5–20

A spiral compact fluorescent lamp with bayonet cap
$2–6

A traditional pear-shaped halogen lamp with bayonet cap

$2–6

Circular fluorescent tubeLinear fluorescent tube
$3–15

Typical directional light bulb and price

MR16 replacement LED downlight
$5–20

A downlight compact fluorescent lamp with GU10 base

$2–10

Halogen directional light bulb

$2–6

n/a

Colour range

Warm White to Daylight

Warm White to Daylight

Warm White

Warm White to Daylight

Dimmable

Selected brands.

Selected brands.

Yes

No

Life span (hours)

15,000– 30,000

6000– 15,000

2000– 4000

10,000

Replacement globes (over 10 years)

1

2

5

1

 

For more information about energy-efficient lighting, visit www.energyrating.gov.au/lighting.

 

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