Save electricity with LED lightings

Left: LED unit without downlight cap; Middle: 12W LED with cap; Right: Halogen 50W bulb

Although Melbourne is crowned as one of "the most liveable city in the world" in recent years, the ever increasing living cost is somehow killing the low income or big families.  It's never to late to do your  part in putting resources in good use and save the earth.

Well, I shall cut down electricity usage by substituting all 50W Halogen downlights to 12W LEDs (4 LEDs in each bulb).  There're a few base standards in the market, namely GU10, MR16 (GU5.3) and E27.

1. Make sure the current transformer supports the LED unit, normally it's 12V
2. Refer to the table below to see which LED unit to buy in order to achieve the same brightness
3. Get the measurements right before ordering
4. Order LED lightings
   
   Product Spec:
   LEDs quantity: 4 pieces
   LED Source: High Power CREE LED Chips Dimmable
   LED Power:4x3W 12W
   Power consumption: 12W
   Input voltages: AC85V-265V AC12V
   
   Base:MR16 (Other options: E27 MR16 B22 GU10 E14 GU5.3)
   Material of shell:Aluminum Alloy
   Size:55mm x 50mm
   Weight:57g
   
   Lumens:650-750LM(approx)
   Reflctor efficiency:90%
   Light source:4pcs 3Watt High Power LED Chips
   Body temperature:<60 Degree Celsius
   LED work temperature:0-65 Degrees Celsius
   Equivalent to 60W Halogen Bulb
   Approvals: CE, RoHS,CCC,FCC certificate
   Shape: Round
   Average rated lifespan: 50,0000 hours under normal usage
5. Replace halogen bulb for LED ones, test it.  If LED unit flickers, check the pin connection or transformer

Below is the table to compare between incandescent and LED to emit the same amount of light.

Lumens (lm)	Incandescent (W)	LED (W)
2600	150	25 - 28
1600	100	16 - 20
1100	75	9 - 13
800	60	8 - 12
450	40	6 - 9

Color temperature table

Color Temperature	Value	Areas
Warm White (yellowish glow)	2700K - 3500K	Lounge, Bedroom
Pure White	3500K - 5500K	For your own preference if you find cool white is too bright
Cool White	5500K - 7000K	Kitchen, Office, Bathroom, Laundry

This handy calculator will give you a rough idea on how much you can save.