E-link
PoE Media Converters, PoE Switches and PoE Injectors can be widely used for the
PoE LED Light. Hereby is the application:
LED-based
solid-state lighting (SSL) is now a mainstream technology, replacing
incandescent, halogen, and compact fluorescent lights (CFLs) in commercial,
industrial, and residential use. The benefits of LEDs are well documented and
include a longer operational life, higher energy efficiency, and tiny size for
small-form-factor fixtures. As an example, the 50,000 hours of operational life
for an LED lamp is far longer than the typical 1000 to 2000 hours for
incandescent lamps and 5000 to 10,000 hours for CFLs. Given their longer life,
LEDs lower the access/safety risks and high labor costs of replacing a
hard-to-reach lamp. LEDs also cost much less to operate and the brightness of
the light emitted by a 10W LED lamp is roughly equivalent to a 60W incandescent
bulb.
While
the benefits of using LED lights are now well understood, the best way to power
them efficiently remains debatable. Here we explain how DC power can be
provided to LEDs by using modern power over Ethernet (PoE) technology. When PoE
technology is compared to traditional AC mains power for lighting, system
efficiency is comparable. However, the PoE technology wins when you add the
advanced benefits of networking the lights using the Ethernet local area
network (LAN) and the lower costs of LED maintenance.
DC power with PoE technology
LEDs are inherently
low-voltage DC devices. To ensure compatibility with traditional AC power, most
LED drivers for lighting use an AC-to-DC converter to convert the AC mains
power to a lower DC voltage. This conversion process reduces system efficiency,
so designers have proposed DC-based power systems. A few studies have compared
the costs for the prevalent AC system approach with a DC-powered system. One
study by Carnegie Mellon University "found: a savings of $2,000 per year
using DC instead of AC. If the LEDs were powered with solar PV power augmented
with grid electricity, even bigger savings of $5,000 per year could be gained
by using DC instead of AC."
Today, you can provide the
DC power to LED lamps with PoE technology, which is regulated by the IEEE 802.3
standard, originally released in 2003 and updated in 2009.4 This standard
specifies that power and communication data be delivered across a single
standard network cable (i.e., Cat5) directly to the connected devices. Power is
provided via the power-sourcing equipment (PSE) located in the switch/hub. The
connected device receiving the power (i.e., the LED lamp in our example) is
called a powered device (PD).
Braver Huang
Personal Email: braverhuang@gmail.com | Skype:
braverhuang | Wechat: BraverHuang | QQ:
1635256367
Industrial Media Converters | CCTV Fiber Converters | PoE Media
Converters | Ethernet over Coax Extender | AHD, CVI, TVI Fiber
Transceiver
