LEDs are solid-state devices. The advantages are:
1) Light Generated by LED is Directional
A. LED is all forward directional lighting, not Omni as conventional light bulb.
B. In general, beam angel is around 140 degree.
C. Utilize this directional characteristics and employee optical lens can achieve different light patterns.
2) LED can Generate Different Light Color
A. Wavelength determinate light color output: red, green, blue, yellow, or purple.
B. RGB light mix or different phosphor mix will create white light.
3) Temperature will Affect LED Efficacy
A. LED itself will generate heat, which will affect efficacy as well as LED life.
B. In general, 10 Degree increase will reduce 5 – 7% lumen output
C. Maintain P-N Junction temperature under 75 degree will enable LED last for over 50,000 hours.
4) Low Energy Consumption
A. 100 lm/W is commercialized, while over 200lm/W is achieved in lab.
B. ILess than 1/5 to 1/10 power consumption of conventional lighting is achieving or 80% to 90% of energy will be saved.
5) Long Life
A. No fragile parts, as conventional light bulb, to be broken.
B. Light will decay lumen output, but rarely burn out or dead.
C. A well-designed luminaire expects over 70% lumen maintenance at 50,000 hours usage.