Environmental Lighting for Mines: Rules and Running Costs

Environmental lighting on a mine means lighting that is bright enough to meet safety law, no brighter than the task needs, aimed at the work and not at the sky, and switched or dimmed when nobody is there. It also costs less to run. Retrofit reports from mining and industrial sites show cuts of about 50% to 77% in lighting power (NV Energy, Sime Darby, January 2025), and the biggest saving depends on how many hours a year the lights burn, not only on the lamp you buy.

This page is for mine managers, engineers, consultants and investors who want to know what environmental lighting means in practice, what the rules say, what the measured savings look like, how to work out the running cost and carbon of one fixture, and what to ask a supplier. It uses figures from the US mine safety regulator, a peer-reviewed measurement study at a gold mine, a utility fact sheet and two company case studies. We do not recommend any lamp brand.

What environmental lighting means on a mine site

People use the term in three ways, and a mine usually needs all three. The first is low energy: fixtures that make more light per watt and controls that cut the hours. The second is low spill: light that falls on the haul road, the plant or the face and not on the sky, the pit rim, a stream or a neighbour. The third is low harm to wildlife and neighbours: warm colours, shielding and dark zones around habitat. Lumen is the unit of light output from a lamp, and lux or foot-candle is the light that lands on a surface. A watt is only the power the lamp draws, so an LED of about 90 W can replace an older 400 W lamp, as at one Australian site (Sime Darby, 17 January 2025).

The cost angle is real because many mine lights burn all night, every night. A utility fact sheet for Nevada mines uses 4,300 hours a year as the figure for outdoor lights that stay on from dusk to dawn, and notes that most truck bays, maintenance areas and mill buildings run 24 hours a day (NV Energy). Underground, the lights are never switched off. For retrofit payback and product types, see our separate guide to mine LED lighting and MSHA rules. This page covers the environmental side and the running cost per fixture.

Lighting rules that apply before any green choice

Safety law sets the floor, and environmental design works above it. In the United States the Mine Safety and Health Administration (MSHA) writes the rules, and they differ by mine type.

• Surface metal and non-metal mines: 30 CFR 56.17001 says illumination sufficient for safe working conditions must be provided on surface structures, paths, walkways, stairways, switch panels, loading and dumping sites and work areas (eCFR via Cornell LII). There is no lux number in the text, so the standard is a performance test. MSHA’s own toolbox talk lists three related rules: guarding of lights that present a shock or burn hazard (56.12034), weatherproof lamp sockets (56.12035) and records of defects on mobile equipment, which the talk applies to headlights and taillights (56.14100) (MSHA).
• Underground metal and non-metal mines: 30 CFR 57.17010 requires individual electric lamps to be carried for illumination by all persons underground (eCFR via Cornell LII). The surface areas of an underground mine fall under 30 CFR 57.17001, which uses the same wording as 56.17001 (eCFR via Cornell LII).
• Underground coal mines: 30 CFR 75.1719-1 requires lighting in each working place while self-propelled mining equipment is operating there, in addition to cap lamps, with surface brightness of at least 0.06 foot-lamberts in the miner’s normal field of vision (eCFR via Cornell LII). A foot-lambert is a unit of surface brightness.

Two practical points follow. First, dimming and motion sensors must never take a work area below what the inspector would call safe, so keep full output wherever people or mobile equipment are working. Second, other countries set their own rules: confirm the standard that applies to your licence with your regulator before you change any lighting. Rules outside the United States are not covered here.

How much power mine lighting uses, and what retrofits cut

The best measured mining example is a peer-reviewed study of an underground gold mine near Carltonville, South Africa, done for the utility Eskom’s demand-side management programme. The lights run 24 hours a day, 365 days a year. Before the retrofit, 2,395 fixtures drew 287.6 kW in total; after it, the installed load was 131.2 kW, a cut of about 156 kW against a contracted target of 157 kW (Masopoga and van der Merwe, Journal of Energy in Southern Africa, 2009). Our arithmetic from that cut: 156 kW for 8,760 hours is about 1.37 GWh a year. Note that this was a fluorescent-to-fluorescent and compact-fluorescent retrofit, not LED, and the study was published in 2009. It shows how much load sits in old tube and incandescent fittings.

Chart

Reported cut in lighting power after a retrofit

Percent; different baselines and lamp types

Chart

Power per fixture before and after retrofits

Watts per fixture; reported cases, not one standard comparison

Chart

Where an underground gold mine’s lighting load sat before its retrofit

Installed load by lamp type, kW; 2,395 fixtures near Carltonville, South Africa (selected types)

The chart below shows where that load was. Two types of fluorescent tube fitting made up about 71% of the 287.6 kW, and incandescent lamps another 78 kW or so.

Other reported retrofits are not all mines, but they show the range for older high-intensity discharge (HID) lamps, a family that includes mercury vapour and metal halide. NV Energy says swapping HID fixtures for LEDs in truck bays, maintenance areas, and mill and storage areas can cut energy use nearly in half, and gives a 400 W metal halide to 200 W LED swap as its example for lights that run about 4,300 hours a year (NV Energy). The same fact sheet describes a Nevada mining customer that replaced 50 metal halide fixtures of 150 W with 70 W LEDs and 150 fixtures of 175 W with 98 W LEDs, for an estimated 206,300 kWh a year saved. By wattage that is about a 46% cut in connected load (our arithmetic). Salmon Earthmoving, an Australian contractor owned by the Sime Darby group, replaced 64 high bays of 400 W with LEDs of about 90 W each, a 77% cut in lighting demand, and reported more than 40 MWh a year saved, about AU$7,000 a year, and about 20 tonnes of CO2 a year (Sime Darby, 17 January 2025). A cold-storage firm in Arkansas, with one warehouse in a former underground limestone mine, replaced nearly 600 fixtures of 400 W metal halide and reported a 70% cut, 1.3 million kWh saved and about $86,000 in electricity a year (Modern Materials Handling, August 2015). That article is from a supplier case study, so treat it as company-reported.

Read these as examples, not averages: each has a different baseline lamp, hours and fixture count, and the Salmon and cold-storage sites are not working mines. They agree on the direction and on the size of the effect for old HID lamps.

Running cost and carbon of one mine light

The same fixture can cost four times as much to run depending on its hours. Energy per year in kWh is watts times hours divided by 1,000. A 400 W lamp on for 4,300 hours uses 1,720 kWh. A 200 W LED on for the same hours uses 860 kWh. On a 24-hour circuit of 8,760 hours the same two lamps use 3,504 kWh and 1,752 kWh.

Chart

Yearly energy per fixture by hours of use

kWh per year; our calculation from wattage times hours

The Salmon numbers carry a hint about hours. Dropping 64 lamps by 310 W each frees 19.84 kW; 40 MWh a year divided by 19.84 kW is about 2,000 hours, so those lights burned about half the NV Energy figure. Our calculation, from the two published values.

Money and carbon both follow from your own tariff. For carbon, the US Environmental Protection Agency’s greenhouse gas equivalencies calculator uses 823.1 pounds of CO2 per MWh for the US grid average in 2022 data, which it converts to about 0.394 kg of CO2 per kWh delivered after grid losses of about 5.1% (US EPA). Your grid may be cleaner or dirtier, and a mine on diesel generators will have a much higher figure per kWh, so use your own factor if you have one. The calculator below uses these inputs; change them to your numbers.

Design rules that cut light spill and wildlife harm

Artificial light at night affects animals, and insects are the best-studied group. A review in Ecology and Evolution found that short (blue) wavelengths are disproportionately attractive to many insects, and it cites work that 30% to 40% of insects approaching street lamps die soon afterwards. It also notes that mercury vapour and metal halide lamps give off ultraviolet radiation, and that LEDs can be made to emit nearly monochromatic light (Owens and Lewis, Ecology and Evolution, 2018). So the lamp type matters less than its colour and where it points.

The National Park Service publishes six outdoor lighting principles. They were written for parks, but they apply to mine boundaries, waste dumps and camps next to sensitive land. In summary (US National Park Service, updated June 2025):

1. Ask whether a light is needed at all. Reflective tape or paint can replace a lamp on some roads and trails.
2. Light only where needed, with the right height and beam shape so light does not spill beyond the task area.
3. Use recessed, fully shielded fixtures that send light down and not into the sky. Avoid globes and sideways floodlights.
4. Light only when needed, with timers, motion detectors and dimmers.
5. Use the minimum light level the task needs. More output does not always mean more safety, because glare can reduce visibility.
6. Use warm colours. The NPS suggests 2700 K for many uses and 2200 K or amber for sensitive environments, and says LEDs above 2700 K contain a moderate to large share of blue light.

On a mine, rule 5 has to give way to the legal minimum in the previous section wherever people work. The savings come from rules 1 to 4: switch off or dim empty areas, cut spill at the pit rim and dump, and use shields. Add a lighting log to the site environmental plan so that the choices are on record. For the wider picture of how mines change land, water and habitat, see why open pit mining is bad for the environment, and the video below.

▶ The 7 environmental impacts of mining, explained in clay with satellite maps · 2:31

What mine lighting costs: the items to price

Prices for mine-rated fixtures vary with hazard rating, mounting and voltage, so there is no single price list. So the table below lists what to put in a quote and where its number comes from. Fill the right-hand column from your own quotes and tariff.

Two published cases show how widely the cost per kWh can differ. Dividing the reported saving by the reported energy saved gives about US$0.066 per kWh for the Arkansas cold-store case (US$86,000 over 1.3 million kWh) and about AU$0.175 per kWh for the Salmon case (AU$7,000 over 40 MWh). That is our division of the two published figures, and it mixes years, countries and tariffs. Use your own bill. Salmon also used the Australian Government’s Emissions Reduction Fund, which covered the installation through the sale of carbon credits (Sime Darby), so check whether your state or utility offers rebates.

Lighting is a small line in a mine budget, and the cost of a retrofit sits alongside everything else in the plan. Our course chapter on mine plan costs shows how operating cost items are built up and compared, shown below.

▶ Farmonaut Mining Pro course: how mine plan costs are built up, with AISC and break-even · 14:58

Mine lighting options compared

This table compares lamp families on the points that matter for environmental design. It sticks to what the sources above report; it is not a product ranking.

The dimming figure is a supplier-case expectation for a warehouse, not a measured result for a mine, so test sensors in a trial area first.

What to ask a lighting supplier before you buy

• What lumen output and beam pattern does each fixture give on my work area, shown on a layout and not only in the catalogue?
• What is the colour temperature in kelvin, and is a 3000 K or lower option offered for the areas next to habitat?
• Is the fixture fully shielded, and what is the light going upward?
• What is the mine or hazardous-area rating, the warranty period, and what does the warranty exclude?
• What are the dimming and sensor options, and can they be locked to a minimum safe level where people work?
• What is the total power at the circuit, and what is the electricity per year at my hours and my tariff?
• Who removes and recycles the old lamps? Mercury vapour lamps contain mercury and need proper disposal under local rules.

Where satellite data fits

Lighting does not need satellite data, but the early stage of a mine does: the licence area, the access routes and the sensitive land near it are all things to check before you design a site. Farmonaut offers satellite-based mineral detection for exploration targets from a licence boundary, and you can send your site details through the mining query form or contact the team. The video below explains how the platform works. Results are exploration targets and not an environmental clearance, and they do not replace a lighting design or an impact assessment.

Other pages on this site cover electric mining trucks, another way sites are cutting diesel use and fumes.

▶ What Farmonaut Mining Pro does with a licence boundary · 4:56

Related reading on this site: Magna Mining Stock (NICU): Mines, Costs, PEA Numbers.

We cover a connected topic in B2Gold Mines: Output, Costs and Environmental Record.

Frequently asked questions

What is environmental lighting in mining?

It is lighting that meets safety law while using less power, spilling less light and harming less wildlife. In practice it means efficient fixtures, shielding, warm colours, and controls that dim or switch off lights where nobody is working.

How much power can a lighting retrofit save at a mine?

Reports range widely. An underground gold mine cut its lighting load from 287.6 kW to 131.2 kW, about 54%, using fluorescent upgrades (Journal of Energy in Southern Africa, 2009). NV Energy gives about half for HID-to-LED swaps, and Salmon Earthmoving reported 77% from 400 W lamps to about 90 W LEDs (Sime Darby, 2025). Your result depends on the old lamps, the new fixtures and the hours.

Is there a legal lux level for surface mine lighting in the US?

Not in the text of 30 CFR 56.17001, which asks for illumination sufficient to provide safe working conditions. Underground coal mines have a numeric minimum of 0.06 foot-lamberts of surface brightness in 30 CFR 75.1719-1.

Do LED lights harm wildlife less than older lamps?

Not automatically. LEDs can be made warm in colour and tightly aimed, which helps. White LEDs with a lot of blue light can attract insects, because short wavelengths are disproportionately attractive to many of them (Owens and Lewis, 2018). The National Park Service suggests 2700 K for many uses and 2200 K or amber in sensitive areas.

How do I work out the yearly running cost of one fixture?

Multiply watts by hours a year and divide by 1,000 to get kWh, then multiply by your price per kWh. A 200 W LED on 4,300 hours a year uses 860 kWh. The calculator on this page does the sum for old and new fixtures and the carbon.

How many hours a year do mine lights burn?

It depends on the site. NV Energy uses 4,300 hours a year for outdoor lights on all night, every night, and 24-hour operation is 8,760 hours. The Salmon figures imply about 2,000 hours. Check your own timer or log.

Can I dim mine lights to save energy?

Yes, where the area is empty, but not below a safe level where people or mobile equipment are working. The surface standard has no lux number, so keep records and test the dimming settings in a trial area.

What carbon factor should I use for lighting?

Use your own grid or generator figure if you have one. The US EPA calculator uses about 0.394 kg of CO2 per kWh for delivered US grid electricity, from 2022 data.

Are cap lamps required underground?

In US underground metal and non-metal mines, 30 CFR 57.17010 requires individual electric lamps to be carried by all persons underground. Underground coal rules add working-place lighting on top of cap lamps.

Does satellite imagery help with mine lighting?

Not directly. Satellite data helps at the earlier stage, when you map a licence area, access and nearby land. Farmonaut’s satellite mineral detection gives exploration targets and is not an environmental clearance.

This page is for information only. Confirm lighting and safety rules with your regulator and a qualified engineer.