LED flood light power consumption depends on the fixture’s total input power, operating hours, and the number of lights installed. A 50W floodlight uses 0.05 kWh per hour, while a 100W floodlight uses 0.1 kWh per hour when operating at their stated input power.
LED flood lights can lower electricity costs when they provide the required illumination using less power than the existing lighting system. To estimate running costs and savings, compare actual input power, operating schedules, lighting performance, and the applicable electricity rate.
This guide explains how to calculate floodlight electricity consumption, estimate costs in Saudi riyals, and select suitable lighting for your project.
LED floodlights can provide efficient illumination, but their total electricity consumption depends on wattage, operating hours, and fixture quantity.
For example, one 50W floodlight operating for six hours consumes 0.3 kWh. Ten identical fixtures running for the same period consume 3 kWh.
An oversized fixture or an unnecessarily long operating schedule can increase costs even when the system uses LED technology. The aim is to deliver the required illumination with suitable fixtures and operating hours.
Floodlight wattage varies by model and application. A smaller area may need a lower-power fixture, while a large industrial yard may require multiple higher-power luminaires.
Check the complete fixture’s total input power in its technical datasheet, including the driver. LED chip wattage alone does not represent the complete luminaire’s electricity consumption.
Wattage also does not tell you whether a fixture will provide suitable lighting. Selection depends on:
For a fixture operating at constant power, use:
Energy consumption (kWh) = Total input power (W) ÷ 1,000 × Operating hours
For multiple identical fixtures:
Total energy consumption = Consumption per fixture × Number of fixtures
If the system dims during the night, calculate each operating stage separately using its actual power draw, then add the results. A brightness setting of 50% does not necessarily mean the fixture consumes exactly half its full-output power.
For one 100W fixture operating for 10 hours daily:
The following table assumes one fixture operating at its stated total input power for 10 hours daily, over 30 days.
| Total input power | Daily consumption | Consumption over 30 days |
|---|---|---|
| 20W | 0.2 kWh | 6 kWh |
| 50W | 0.5 kWh | 15 kWh |
| 100W | 1 kWh | 30 kWh |
| 150W | 1.5 kWh | 45 kWh |
| 200W | 2 kWh | 60 kWh |
| 300W | 3 kWh | 90 kWh |
These are calculation examples, not an Alrouf product specification table. They show consumption but do not establish which wattage provides sufficient illumination for your site.
Multiply electricity consumption by the applicable electricity rate:
Energy cost = Energy consumption (kWh) × Electricity rate per kWh
For projects in Saudi Arabia, use the rate applicable to the site’s electricity account. If different rates apply during different periods, calculate the consumption and cost for each period separately.
The examples below use a hypothetical rate of SAR 0.20 per kWh to demonstrate the calculation. This is not a statement of the current Saudi electricity tariff.
Each example assumes one fixture operating for 10 hours daily over 30 days.
| Total input power | Consumption over 30 days | Illustrative energy cost |
|---|---|---|
| 20W | 6 kWh | SAR 1.20 |
| 50W | 15 kWh | SAR 3.00 |
| 100W | 30 kWh | SAR 6.00 |
| 150W | 45 kWh | SAR 9.00 |
| 200W | 60 kWh | SAR 12.00 |
| 300W | 90 kWh | SAR 18.00 |
For example, ten 100W floodlights running on this schedule consume 300 kWh over 30 days. At the illustrative rate above, their combined energy cost would be:
300 × SAR 0.20 = SAR 60
For your own installation, use:
Monthly energy cost = Input power (W) ÷ 1,000 × Daily operating hours × Days in the month × Number of fixtures × Rate per kWh
Replace the example rate with the applicable rate on your electricity bill. These calculations cover energy charges only; taxes, other billing charges, installation, and maintenance should be assessed separately.
Savings depend on the difference between the existing system’s total input power and the proposed replacement’s input power.
Compare systems that meet the same lighting requirements, including illumination levels, coverage, uniformity, and glare control. Wattage alone does not establish equivalent lighting performance.
The following example compares a system drawing 250W per fixture with a proposed LED system drawing 100W per fixture.
These wattages are hypothetical calculation inputs, not a recommended replacement specification. A lighting assessment must confirm whether the proposed fixtures meet the site’s requirements.
Assuming 10 fixtures operating for 10 hours daily over 30 days:
| System | Input power per fixture | Number of fixtures | Consumption over 30 days |
|---|---|---|---|
| Existing system | 250W | 10 | 750 kWh |
| Proposed LED system | 100W | 10 | 300 kWh |
| Difference | — | — | 450 kWh |
Under these assumptions, the calculated energy reduction is:
(750 − 300) ÷ 750 × 100 = 60%
To estimate the financial saving, multiply the 450 kWh difference by the applicable electricity rate.
Actual savings depend on confirmed fixture input power, fixture quantity, lighting performance, and operating hours.
A floodlight should meet the area’s lighting requirements without unnecessary power consumption. The lowest-wattage fixture is not automatically the most suitable option.
Lumens describe light output, while lumens per watt describe luminous efficacy.
Compare figures for the complete luminaire rather than relying only on LED chip specifications. Also assess how effectively the fixture directs light onto the required area.
Beam distribution, mounting height, fixture position, and aiming affect coverage and glare.
For larger projects, request photometric files and a lighting calculation before selecting fixtures. This helps assess whether the proposed arrangement delivers suitable illumination across the site.
Review the selected model’s:
For Saudi outdoor projects, assess site temperatures, dust exposure, and coastal conditions where relevant.
Explore Alrouf’s industrial lighting solutions to compare options for different applications.
For large outdoor and industrial areas, review the Alrouf N Series LED Flood Light and request technical specifications for the model being considered.
Reducing unnecessary operating hours can lower consumption alongside improvements in fixture efficiency.
Depending on the application and equipment compatibility, control options include:
Confirm that the selected driver supports the required control method. Security, operational, and safety requirements should determine when lighting can switch off or dim.
For further reading, see the U.S. Department of Energy’s exterior lighting guidance.
Electricity savings are one part of the upgrade calculation. Also consider:
Review the selected product’s rated life, warranty terms, and operating conditions rather than assuming every LED floodlight has the same lifespan.
Outdoor temperature, driver performance, installation quality, and maintenance can affect long-term operation.
Use:
Simple payback period = Net installed upgrade cost ÷ Estimated annual cost savings
For example, an upgrade costing SAR 6,000 with estimated annual savings of SAR 2,000 has a simple payback period of three years.
These figures are hypothetical. Use actual quotations, applicable electricity rates, and realistic savings estimates to assess your project. Simple payback does not account for financing costs or changes in future electricity rates.
At a constant total input power of 50W, it consumes 0.05 kWh per hour. Operating it for 10 hours daily uses 0.5 kWh per day, or 15 kWh over 30 days.
At a constant total input power of 100W, it consumes 0.1 kWh per hour. Operating it for 10 hours daily uses 1 kWh per day, or 30 kWh over 30 days.
Multiply its consumption by your applicable electricity rate. A 100W fixture operating for 10 hours daily consumes 30 kWh over 30 days. At a hypothetical rate of SAR 0.20 per kWh, its energy cost would be SAR 6, excluding taxes and other charges.
Power draw depends on the model and operating settings. Check the complete fixture’s total input power in its technical datasheet, including the driver. Choose the fixture according to the required lighting performance, mounting conditions, and beam distribution.
They can be cheaper to run when they deliver the required illumination at a lower total input power. Compare lighting performance and consumption for the specific fixtures rather than assuming a fixed savings percentage.
Do not assume equivalence from wattage alone. Check light output, beam distribution, mounting conditions, and illumination across the target area.
They can reduce consumption by limiting unnecessary operation or adjusting output. Savings depend on activity levels, control settings, equipment compatibility, and the site’s lighting requirements.
No. Watts describe electrical power, while lumens describe light output. Fixtures drawing the same power can provide different light output and distribution.
Provide the existing fixture count, total input power, operating hours, applicable electricity rate, site dimensions, mounting details, and required lighting performance. Include maintenance costs if available.
To discuss suitable floodlighting, share your project location, application, fixture quantity, existing wattage, mounting height, site layout, and operating schedule.
Request a floodlighting quotation from Alrouf to review fixture options and the information needed to estimate energy consumption and upgrade costs.
