Specialists in LED Lighting and ENERGY EFFICIENCY Solutions             See Our Product Range
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Area and Carpark

Our roadway lighting products provide optimum safety and security to outdoor areas
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Building features are enhanced with crisp illumination from our architectural range
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The precise illumination of our LED commericial range provides reduced glare for a pleasant work ambience
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The bright even illumination of our Industrial range speeds production, and avoids on the job accidents
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Response of the Eye to Light

Scoptic Lumens is the theory of understanding the response of the human eye to light. Eye responses not only to the intensity of light but also to the wavelength with 2 types of sensing cells, rods and cones affecting how the light signal is sent to the brain and images formed

Scoptic lumens also influence the final outcome of lighting solutions which this presentation explores the science behind it to select the correct lighting products


Case Study

LED 8,040 Lumens VS HPS 19,000 lumens

The image below shows 2 side by side carparks, one lit with LED parking lights of total 8,040 lumens (left) and the other with HPS lights of total 19,000 lumens (right) to which the LEDs appear brighter due to improved scoptics, better CRI and uniformity

LED lights appear brighter even at 50% less lumens resulting from better distribution, efficiency and uniformity with reduced spill lighting


* Majority of workers prefer lux levels other than that set out by IESNA

Measuring Eye Response to Light

The sensitivity of the eye to light can be measured with Scoptic and Photoptic curves as seen by the diagram below


                 * Majority of workers prefer lux levels other than that set out by IESNA



The Photopic Sensitivity curve measures the sensitivity of the cone cells which is relevant to intensity of the light whereas the Scoptic Sensitivity curves measures the sensitivity of the rod cells which is prevalent in low brightness conditions such as offices, warehouses, street lighting and most artificial lighting applications


Measuring Image Sharpness of Light

Image sharpness of lighting relative to the human eye can also be measured using the S/P ratio which is a measure of scoptic sensitivity to photopic sensitivity. This is important because rod cell response is dependent on S/P ratio

Generally the rod cells regulate the size of the pupils so the more rod cells stimulated means smaller pupil size which means sharper image as less stray light enters the eye

Rod cells respond well to a high Scoptic/Photoptic lumen Ratios. Higher S/P ratio means greater stimulation of rod cells meaning a smaller pupil size and sharper image

* Majority of workers prefer lux levels other than that set out by IESNA

Cost Benefit Analysis

The effect of good workplace lighting can also be translated into real $ figures as demonstrated in a real life case study below.

Medium to large size office building

  • Building Area 10,000 (sq. feet)
  • Number of Employees 65
  • Average Occupancy (sq. feet/Person) 154

Based on a study by NEMA the following tables estimate employee and energy costs for a typical commercial facility


Research shows that effective lighting can increase productivity by as much as 3-5% and LED lighting can save an average of 25% on total power usages. Applying these figures to the human resources and energy operation costs calculated earlier we can forecast substantial savings



Although there are fair savings from reduced in energy usage of LED of $4,750, the real cost benefits come from potential gains to productivity, being in excess of $62,000! This shows that factoring in savings without productivity increases can be a gross estimation of potential gains by as much as 93% which can have important consequences for the payment period

Typically an LED project has a payback period of 2 years based on energy savings alone, but factor in productivity gains and it has payback in less than a month!


Productivity Savings
Energy Savings 
Total Savings

Latest LED Technology

SunLED Industries provides economical exterior, industrial and commercial lighting solutions using the latest high performance LED lighting technologies and practical design strategies. 

As a result of this approach we are able to reduce the overall finished construction cost of numerous applications and commercial construction projects.

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Dedicated Customer Support


Together with our professional services delivered by qualified industry experts we can provide complete service reliability designed to exceed customer expectations.

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Our Services

SunLED Industries are LED lighting distributers and designers specialising in exterior, industrial and commercial applications. You can view the full range of services by clicking on the services menu or links below

  • Lighting design and consultation
  • Sales and customer service support
  • Road and sports lighting
  • Cost analysis and reverse engineering
  • Renovation and retrofits
  • Modelling and 3D rendering
  • Lighting strategy reports
  • Energy saving calculations
  • Financial and payback analysis
  • Due diligence and witness consulting
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14210 Roosevelt Ave Flushing, NY 11354 United States +1 917 563 7078