Photometric Surveys Dallas Suburbs & Light Level / Illumination Surveys


Light levels are also regulated as a minimum amount of ambient light is required for task lighting, surgical, patient and hospital environments, street and residential illumination, parking lots, parking garages, emergency lighting, stairwells, exit signs, etc. Also, specific levels of lighting are measured in lux (metric per square meter) or candlepower (also known as foot candles which is a standard per square foot) are recommended for different types of tasks which vary from quality inspection to operating rooms.

Many cities such as McKinney, Frisco, Southlake, Flower Mound, Euless, Grapevine and Plano have lighting / photometric illumination / glare ordinances which limit the amount of light which can emanate from the borders and perimeters of a property as well as the amount of lighting reflected from the ground. (glare) The amount allowed depends on how the neighborhood is zoned. (residential / light commercial, etc.) Parking lot lighting may cause excessive light to be transmitted through the windows of an adjacent bedroom window in which case light level testing is called for. In many cases the lighting survey data is compared to photometric maps prepared by a lighting or other relevant professional engineer.

Other aspects to consider are the total illumination output of the light (measured in foot candles or lumens) and distribution across the emitting surface, color temperature of light, (measured in K or Kelvin) diffusivity, distance from the light fixture to the surface(s) to be illuminated, the color, texture and composition of the surface(s) and type of lighting. (incandescent, fluorescent, halogen, LED, etc.)

ScanTech has light meters which are suitable for measuring virtually all forms of lighting including LED with color and cosine correction built in for greater accuracy.



Please provide the following information:

1) Photometric plan from the PE (Professional Engineer) showing the property layout, locations of fixtures and predicted light levels in candlepower

2) Physical address of the target site and / or the nearest intersection and corner of that intersection as many new builds do not show up in Google Maps

3) Nature of the business  (restaurant, warehouse, etc.)

4) Verify that all exterior lighting including individual bulbs / fixtures / circuit breakers are working to avoid charges for extra trip fees. Please note any change orders where fixtures are moved, added or deleted to avoid confusion

5) Your name, title or position, company name, email address and the best phone number(s) and when to reach you

6) How soon you need the survey (notice that photometric surveys are subject to weather conditions and visibility with a minimum of 6 nautical miles so cannot be done on rainy days)

7)  Any special access to the site such as gates, locks, key lock boxes, access codes and / or a contact person to meet onsite

8) Form of payment preferred (for any Certificate of Occupancy work, we request payment upon receipt of the report – generally a credit card number charged at the time the report is sent)


Dallas Area Photometric Survey Quote Downloadable Form



Photometric Survey Map Readings

Photometric Survey Map Readings Example


Datalogging light levels over long spans of time to see lighting level trends or shorter intervals to determine flicker rates are also available services.

Step Lighting Design Safety

Step Lighting Safety Design


There are also appropriate levels of lighting for ATM (Automated Teller Machines) and banking security compliance, ADA lighting requirement surveys and is often a part of the property exchange / due diligence / renovation process.

ATM Machine Light Requirements for Security

ATM Machine Lighting Requirements for Safety


Flicker rates can cause headaches and fatigue, impair productivity and be indicative of faulty lighting equipment which can propagate or indicate EMI (Electromagnetic Interference) from other sources present in your facility.

Percent Flicker and Flicker Index Different Light Sources

Percent Flicker and Flicker Index Different Light Sources


Excess radiated light at the wrong times of day (particularly the shorter wavelengths) can interfere with melatonin synthesis, circadian rhythms and create issues with insomnia, lack of restful REM sleep, unnecessary fatigue and a general lack of alertness. This is a genuine health hazard that broadly affects the quality of life from proper immune system function to increased risk of accidents.

Graph Showing Circadian Sensitivity vs. LED Light Wavelength

Graph Showing Circadian Sensitivity vs. LED Light Wavelength



ScanTech can measure light levels that are normally invisible such as in the UV-A / UV-B (also known as UVA and UVB) spectrums which comprise wavelengths from 280 nm – 390 nm  (nanometer) and the important part of the UVC / UV-C spectrum which is considered to be in the range of 100 nm – 280 nm and is often used for germicidal / sterilization processes such as the 254 nm band.

While useful for many forensic and industrial / medical processes, these wavelengths can cause damage to human skin, (skin cancer / melanoma)  eyes from welding, paintings, artwork, historical museum pieces, fabrics and dyed products, rubber, polymers, etc.

If you require consultation for either health & safety, the preservation of materials (either modern or of historical significance such as artifacts) or need to gauge the exposures / effectiveness of an ultraviolet related application or impacted environment, then contact ScanTech.

ScanTech services and consults in the Dallas – Houston – Austin – Fort Worth and San Antonio metropolitan regions and beyond.



Lighting Calculator and Light Level Guide for Rooms

Indoor and Outdoor Lighting Levels in Lux and Candlepower (foot candles)

Weather History Visibility Nautical Miles



Ergonomic Computer Use Sitting and Standing Calculator


Plano, Highland Park, University Park, Park Cities, Las Colinas, Arlington, Dallas, Fort Worth, Houston, Austin, San Antonio, Grapevine, Frisco, Denton, McKinney, Allen, Lewisville, Irving, Mesquite, Bedford, Euless, Richardson, Coppell, Grand Prairie, Garland, Addison, Farmers Branch, Rockwall, Carrollton, Parker, Rowlett, Lucas, Fairview, Park Cities, Keller, Roanoke, The Colony, Highland Village, Lake Dallas, Corinth, Prosper, Duncanville, Lancaster, Rowlett, Royse City, Princeton, Trophy Club, Southlake, Hurst and the general DFW area.