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Technical Luncheon - Dirt Depreciation on Outdoor LED Luminaires

  • Executive Royal Hotel West Edmonton 10010 178 Street Northwest Edmonton, AB, T5S 1T3 Canada (map)


Doors will be open at 11:30AM with the speakers starting at 12PM. A hot lunch will be provided – please message us after your registration if you have any specific dietary needs.


Light-emitting diode (LED) luminaires present new challenges for those maintaining outdoor and roadway-lighting systems. In other luminaire types, maintenance crews often clean the luminaires when they do a bulk or single relamp, so the lamp life drives the cleaning schedule. However, LED-based luminaires are being marketed as lasting longer and requiring less maintenance than other luminaire types. As a result, they will be exposed longer to environmental dirt and other contaminants that can adhere to the luminaire and reduce the amount of light that reaches the road. This creates a different maintenance paradigm for LED luminaires, and their potential for dirt depreciation should be carefully investigated. This presentation considers the approach, and methods, as well as research results studying dirt depreciation. These results are discussed in the context of today’s changing roadway lighting environment, and makes recommendations to stakeholders in roadway lighting regarding LDD for LED luminaires.

Who should attend:

  • Engineers, Lighting Designers;
  • Municipality and Facility Managers and Maintenance Personel;
  • Electrical Contractors and installers;
  • Anyone involved with outdoor lighting and its current challenges.

Food & Drinks: Lunch will be provided as part of the cost. Please send us a message if you have any dietary restrictions.

Location: The seminar will at the Executive Royal Hotel – Edmonton.

Speaker Bio:

Ron Gibbons is the Director of the Center for Infrastructure Based Safety Systems at the Virginia Tech Transportation Institute (VTTI). He is also the Institute’s lead lighting research scientist. He is currently the PI on projects investigating the Spectral Effects of new light sources on roadways, the visibility of police vehicles and on an investigation into the adaptive lighting of roadways. Dr. Gibbons is also the PI and Project Manager for a safety IDIQ project sponsored by the Federal Highway Administration and a subject matter expert for the National Surface Transportation Safety Center of Excellence. Gibbons is the author of over 80 published papers on roadway lighting, photometry, and target visibility. He is the current Director of Division 4 of the International Commission on Illumination (CIE) and a past president of the Illuminating Engineering Society of North America.

Dr. Ron Gibbons

Dr. Ron Gibbons



Can I use my IES membership for a discount?

Yes! Look for the "Enter Promotional Code" link in the top right corner of the Select Tickets page to enter your individual IES number and reveal a hidden ticket including discount.

The registration only allows one ticket to be purchased for IES members?

The IES membership discount applies only to the IES member. Additional attendees are to be registered as non-IES members.

What are my transport/parking options getting to the event?

Free Parking is available at the event venue.

Is my registration/ticket transferrable?

Yes, just let us know when you arrive so we can keep track of the attendees.

Do I have to bring my printed ticket to the event?


What is the refund policy?

Please let us know as soon as possible if you cannot attend, and we will arrange for a refund prior to the event.

The name on the registration/ticket doesn't match the attendee. Is that okay?

Yes, please check in with us when you arrive.

Is the seminar accredited for continuing education credits?

Yes. Please ask us for AIA course credit information when you arrive.