Your questions answered: Next-generation lighting: the emergence of PoE for lighting and controls

Your questions answered: Next-generation lighting: the emergence of PoE for lighting and controls.


John Casadonte, Product Marketing Manager, Cree Inc.Using Power over Ethernet (PoE) not only cuts installation and commissioning costs, but—more importantly—opens the door to endless building integration options that build upon the idea of intelligent or high-performance buildings. Read answers to questions that were not addressed in the live Sept. 20, 2016, webcast Next-generation lighting: the emergence of PoE for lighting and controls.

Question: Do you have case studies that compare a typical office building with fluorescent lamps versus an “equivalent” power over Ethernet (PoE) application?

John Casadonte: Please see this Quest case study for an example.

Question: What is the 90 W standard distance limitation?

Casadonte: 100 meters.

Question: What is the current technology maximum for a PoE wattage available on a given category cable for a lighting fixture?

Casadonte: A little over 100 W as the Cat-x will likely begin to overheat if pushed further. Expectations that new cable technology will be in place as the PoE standards grow.

Question: NFPA 70: National Electrical Code (NEC) requires complete separation of wiring for emergency lighting circuits. How do you configure your system to provide separation of normal power lighting from emergency?

Casadonte: A separate PoE switch and Cat-x cabling.

Question: How do we guard against obsolescence in cabling when Cat-8 is already on the horizon?

Casadonte: A tough question to address. Historically most data vendors have handled product/technology very gracefully, but we are now facing a tremendously fast ramp-up and it is likely some investments today may be lost as time progresses.

Question: Are the PoE lighting devices more energy efficient than their 120/277 V equivalents? That is comparing LED to LED.

Casadonte: About the same.

Question: Will the egress lighting/emergency be color indicating?

Casadonte: All depends on the luminaire. Speaking specifically on our Cree portfolio, we have field changeable color temperatures. In our case, the answer is yes.

<< First < Previous 1 2 3 4 Next > Last >>

No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
Commissioning lighting control systems; 2016 Commissioning Giants; Design high-efficiency hot water systems for hospitals; Evaluating condensation and condensate
Solving HVAC challenges; Thermal comfort criteria; Liquid-immersion cooling; Specifying VRF systems; 2016 Product of the Year winners
MEP Giants; MEP Annual Report; Mergers and acquisitions; Passive, active fire protection; LED retrofits; HVAC energy efficiency
Driving motor efficiency; Preventing Arc Flash in mission critical facilities; Integrating alternative power and existing electrical systems
Putting COPS into context; Designing medium-voltage electrical systems; Planning and designing resilient, efficient data centers; The nine steps of designing generator fuel systems
Designing generator systems; Using online commissioning tools; Selective coordination best practices
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.
click me