Week 28

Progress:

Cost Comparison
Types of lighting sources	Fluorescent tube (Philips TLD 36W/ 54-765)	Fluorescent tube (Philips TLD 18W/ 54-765)	CFL (Philips E27)	LED (Philips E27)	LED (Generic - downlight)	LED (Generic - tube)
Purchase Price (RM)	2.80	4.50	13	45	30	68
Electricity Usage (Watt)	36	18	18	9	5	18
Starting Time (sec)	<5	<5	<5	instant	instant	instant
Lumens (lm)	2600	1030	1100	600	900	900
Lumens/Watt	72	57	61	67	100	100
Color Temperature (Kelvin)	6200	6200	6500	6500	3000	3000
Color Rendering Index
Lifespan (hrs)	13000	13000	8000	15000	25000	25000
Bulb Cost Over 10 years (12 hours usage)	RM 9.43	RM 15.16	RM 71.18	RM 131.40	RM 52.56	RM 119.14
Energy Cost Over 10 years (21.8cents/kWhr)	RM 343.74	RM 171.87	RM 171.87	RM 85.94	RM 47.74	RM 171.87
Total	RM 353.17	RM 187.03	RM 243.05	RM 217.34	RM 100.30	RM 291.01