PoE vs AWG
We started with PoE lighting - why did we switch to AWG 18/2 instead of CAT-6 and RJ45?
Aspect
| PoE - CAT-6
| AWG 18
|
Ease of change
| very high -one plug
| between 2 and 9 wires to move
|
Driver Cost
| between $50 and $150 per LED, plus LED
| about $5 per LED
|
Wall switch cost
| Need a smart switch in each room
| as low as $1 for a simple on/off switch
|
Number of home runs
| one for each group of LEDs - for example, a closet with one LED is a home run
| one home run for 16 LEDs and up to 10 wall Switches.
|
Provisioning
| home does not light up until wall switches are mapped to PoE loads
| home lights up without any configuration
|
LED Options
| ??
| Flat Puck, Recessed, E26, E12, MR16, Strip, Tunable white, and so on
|
PSE cost ( PoE switch vs load center )
| PoE switch 802.3at, rack mount, with fan
$1 per watt for UL listed PoE PSE
Redundancy is very expensive
| PSE Load center cost is $0.50 per watt, with redundancy, fits inside 4 inch studs
|
Frequency of change
| with each office renovation, wall move
| almost never
|
Power losses
a) Autonegotiation losses, PoE switch Loss
b) Copper loss at 30 watts
c) standby power
|
a) has a 3% overhead loss
b) about 1% transmission loss
c) 802.3af has a 300 mW standby per port
|
a) no autonegotiation, no loss
b) same
c) no standby loss
|
Electronics in each LED
| complete PD electronics, plus LED
| zero. nothing but LEDs
|
RJ45 installation
| Commerical pre-fabricated cables and connectors and wire trays make installation fast
| Residential has no wire trays, and terminating RJ45 on ladders is complicated and requires more expensive labor
|
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