12-03-18 Billboard Appendix B - Photometric Analysis
Appendix B:
Photometric Analysis
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330 N. Brand Blvd. Suite 950
Glendale, CA 91203
818.539.1111 • www.exp.com
City of Hayward,
Alameda County
Digital Billboards
Photometric Analysis
Project Number
2017081.00
Prepared By:
Michael Schrupp
Date Submitted
29 May, 2017
City of Hayward, Alameda County
Digital Billboards Photometric Analysis
exp Project No. 2017081.00
29 May, 2017
ii
TABLE OF CONTENTS
1.0 NARRATIVE .................................................................................................................................... 1
2.0 APPENDIX - FOOT-CANDLE LEVEL GRAPHIC SHEETS ........................................................... 3
City of Hayward, Alameda County
Digital Billboards Photometric Analysis
exp Project No. 2017081.00
29 May, 2017
Page 1
1.0 NARRATIVE
We (exp engineering) have conducted a photometric review of the digital billboard being proposed at
17302 Langton Way and 22083 Arbor Ave in Hayward, CA..
Using the photometric software AGI32, we studied the screen’s output brightness to determine the
following:
A) Potential modifications to the sign that may be needed to comply with the OAAA (Outdoor
Advertising Association of America) Lighting Level Guideline, and
B) The impact the sign will have at night on the surrounding community.
The proposed billboard is to be 14’x48’ with the top of the sign mounted at +80’ above the ground
with maximum screen brightness of 300 NITS (300 Candela per Square Meter) in the evening.
Per OAAA guidelines, the proposed sign, displaying a full white image (for maximum brightness)
should not exceed .3 foot candles over the surrounding ambient light levels at a distance of 250’ in
any direction.
The photometry used in this study is based on the specified Nichia series 336 LED modules, which
output light horizontally at 90° and 45° vertically, at the evening output level of 300 Candela per
Square Meter.
As we are unable to determine what the ambient light levels will be at the location, the studies were
done assuming the worst-case scenario of no ambient light.
We have included graphical illustrations demonstrating the light levels in foot-candles we expect from
the screen.
SHEET 1 of the attachment is a location plan at the 17302 Langton Way site, indicating the 250’
boundary overlaid on a map of the proposed site, as well as the projected relative angle of light
emanating from the sign.
SHEET 2 shows the overall light levels at the ground, freeway, and adjacent buildings over the entire
Langton area.
SHEET 3 is a graphic representation of the light levels impacting the adjacent residential buildings
around the Langton site.
City of Hayward, Alameda County
Digital Billboards Photometric Analysis
exp Project No. 2017081.00
29 May, 2017
Page 2
SHEET 4 of the attachment is a location plan at the 22083 Arbor Ave site, indicating the 250’
boundary overlaid on a map of the proposed site, as well as the projected relative angle of light
emanating from the sign.
SHEET 5 shows the overall light levels at the ground, freeway onramp, freeway, and buildings
adjacent to the Arbor area.
SHEET 6 is a graphic representation of the light levels impacting the adjacent residential buildings
around the Arbor site.
Conclusions
We see no light levels in excess of .3fc beyond the 250’ radius of the signs, nor do we find any
significant impact to the neighboring property provided the sign brightness is reduced after dark to the
300 NIT level.
This report, prepared by exp Services Inc., is intended for the exclusive use of Alameda County,
Recon Environmental and Outfront Media. Neither exp Services Inc., Alameda County, Recon
Environmental nor Outfront Media assume any liability for the use of this report, or for the use of any
information disclosed in the report, or for damages resulting from the use of this report, by other
parties.
City of Hayward, Alameda County
Digital Billboards Photometric Analysis
exp Project No. 2017081.00
29 May, 2017
Page 3
Appendix
Foot-candle Level Graphic Sheets
Langton Way
Release: 5/29/2017
Revision: 0
1 of 6
OUTFRONT MEDIA LLC
HAYWARD BILLBOARDS
330 N. Brand Blvd. Suite
950
250’ Boundary
Langton Way
Release: 5/29/2017
Revision: 0
2 of 6
OUTFRONT MEDIA LLC
HAYWARD BILLBOARDS
330 N. Brand Blvd. Suite
950
Overall Photometry Layout
Langton Way
Release: 5/29/2017
Revision: 0
3 of 6
OUTFRONT MEDIA LLC
HAYWARD BILLBOARDS
330 N. Brand Blvd. Suite
950
Adjacent Buildings
Arbor Avenue
Release: 5/29/2017
Revision: 0
4 of 6
OUTFRONT MEDIA LLC
HAYWARD BILLBOARDS
330 N. Brand Blvd. Suite
950
250’ Boundary
Arbor Avenue
Release: 5/29/2017
Revision: 0
5 of 6
OUTFRONT MEDIA LLC
HAYWARD BILLBOARDS
330 N. Brand Blvd. Suite
950
Overall Photometry Layout
Arbor Avenue
Release: 5/29/2017
Revision: 0
6 of 6
OUTFRONT MEDIA LLC
HAYWARD BILLBOARDS
330 N. Brand Blvd. Suite
950
Adjacent Buildings
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