The electricity cost of a red light therapy panel depends on the power it takes from the socket, how long it runs and the electricity rate you actually pay. Optical irradiance, LED count and a large number in a product name are not substitutes for electrical input power. For a useful estimate, use a documented input figure or a suitable wall-power measurement, then convert watts and minutes into kilowatt-hours.

This guide provides a worksheet and clearly hypothetical examples. It does not assign a single electricity tariff to South Africa or claim that any panel has been independently measured. Your municipality, supplier, tariff structure and billing period can change the relevant rate.

Start with the right power number

A red light therapy panel electricity cost estimate needs a clearly stated measurement boundary: the complete setup at the socket, or a narrower rated component. Keep that boundary visible throughout the calculation so readers know what is included.

Electrical power is measured in watts. Energy used over time is commonly billed in kilowatt-hours, or kWh. A device drawing 100 watts continuously for one hour uses 0.1 kWh. The watt figure describes a rate of energy use; the kWh figure describes the accumulated energy.

Optical specifications answer another question. Irradiance, often written in milliwatts per square centimetre, describes light reaching an area under specified measurement conditions. It is not the power taken from your wall socket. You cannot multiply an irradiance number by a session's minutes and call the result an electricity bill.

Our LED device specifications guide explains these distinctions. For cost calculations, look specifically for electrical input power, actual power consumption or a suitable meter reading. If a listing gives only LED chip ratings or optical output, ask the supplier for the missing electrical figure.

A rated figure is useful, but label it correctly

The current listing for the VanqHeal three-colour panel states a rated power of 5 W and a voltage of 5 V. Those are published specifications. They are not a wall-meter test result, and they do not by themselves describe charger losses, standby draw or every operating mode.

If you use a rated figure, call the result a rated-power estimate and state your assumptions. If you have an actual wall reading, record the mode and whether the power supply, cooling system or other connected equipment is included. The two methods can both be useful, but they should not be labelled as the same kind of evidence.

An adapter label also needs care. A maximum output rating describes what the adapter can supply under its specified conditions, not necessarily what the connected panel draws throughout a session. Multiplying the adapter's voltage and current ratings may give its rated output capacity, which is a different quantity from a measured operating demand.

The basic calculation

Use this sequence: divide watts by 1,000 to obtain kilowatts; divide session minutes by 60 to obtain hours; multiply those values for energy per session. Multiply session energy by the number of sessions and then by your applicable rand-per-kWh rate.

For a hypothetical panel drawing 100 W at the socket during a 15-minute session, the calculation is 0.1 kW multiplied by 0.25 hours. That equals 0.025 kWh per session. At an illustrative rate of R3.00 per kWh, the session's energy cost is R0.075, or 7.5 cents.

These values are examples, not a recommended treatment schedule, an actual tariff or a measurement of a VanqHeal product. Keep the decimal places during the calculation and round the final cost. Rounding the session energy too early can distort a monthly estimate, especially for a device with a relatively small draw.

A worksheet you can fill in

Keep a note of where each input came from. A bill, supplier specification and meter reading are different sources. If the operating draw is unknown, leave it blank rather than treating a marketing number as a measurement. The worksheet remains useful because it identifies the exact information you need to request.

If more than one person uses the panel, count the total operating sessions. If your routine varies, an actual monthly session log can be more informative than a full-year projection. The calculation should describe the usage you expect, not encourage longer or more frequent exposure to make a device seem economical.

Compare scenarios without disguising assumptions

The following table uses hypothetical wall draws, 15-minute sessions, 20 sessions per month and an illustrative R3.00 per kWh. It excludes standby and fixed charges. None of the rows is a product test or a recommendation about session frequency.

The table shows a mathematical relationship: with everything else held constant, doubling the draw doubles the energy cost. It says nothing about which panel provides better coverage or results. Electrical consumption is one operating characteristic, not a measure of therapeutic effectiveness or overall product quality.

For an annual example, the hypothetical 100 W panel used for 15 minutes on four occasions each week for 52 weeks would run for 52 hours. Its operating energy would be 5.2 kWh, costing R15.60 at the same illustrative rate. A different routine or tariff changes that result directly.

Include standby when it is relevant

A connected device or adapter may use energy while the treatment lights are off. Whether that happens, and how much it uses, depends on the system. Do not assume a universal standby figure. Check the manufacturer's documentation or use suitable measurement equipment if you want to include it accurately.

To see why standby can matter mathematically, imagine a constant 1 W draw for 24 hours a day over 30 days. That would total 0.72 kWh, or R2.16 at the example rate. This is a deliberately hypothetical continuous-standby calculation, not a claim that the example panel actually draws 1 W when idle.

When combining operating and standby periods, avoid counting the same hour twice. If a device runs for five hours in a 720-hour month, a model that separates the states has 715 standby hours. Follow the manufacturer's instructions for switching off and unplugging; do not change safe operation simply to chase a small calculated saving.

Use the right part of your electricity bill

For the additional energy used by a device, the relevant starting point is the applicable variable charge per kWh. A household bill may also contain fixed or other charges that do not increase directly with one extra session. Dividing the entire bill by total consumption can therefore answer a different question from estimating the device's additional energy cost.

Some tariffs change by consumption block or time period. In that case, use the rate that applies to the added consumption, or show a range if you do not know which band will apply. State whether the rate includes applicable taxes so that comparisons use the same basis.

Do not reuse an old example tariff as though it were today's national price. Check your own bill or supplier's current tariff schedule. If a billing structure is unclear, ask the supplier how additional consumption is charged. The arithmetic is straightforward once the right rate has been identified.

Measure only with suitable equipment

A plug-in energy meter may help measure a compatible mains-powered setup, but use it within its ratings and instructions. It must suit the local supply, plug type and expected load. Do not improvise exposed wiring or open a panel or power adapter to obtain a reading.

For low-power devices, meter resolution matters. A display that rounds to whole watts may not describe a small changing load precisely. An accumulated energy reading over a documented operating period can be useful, provided the instrument is suitable and you follow the device's normal routine rather than extending exposure for a test.

Record whether you measured charging, operation or both. A battery-powered mask charged at the socket is different from a panel operating directly from its supply. Energy entering the charger and energy later used by the LEDs are related but not identical measurements. Describe the measurement boundary before comparing the numbers.

Put running cost alongside the purchase decision

Electricity is one part of ownership cost, alongside the purchase price, accessories, support and any replacement parts. A low energy estimate cannot establish value on its own. You still need a suitable intended use, clear instructions and evidence relevant to the outcome that matters to you.

Save your worksheet with its date, tariff and assumptions. Recalculate when your routine, device or electricity rate changes. That produces a transparent estimate you can update, rather than a supposedly universal cost figure that conceals where the numbers came from.

Frequently Asked Questions

Is the wattage in a panel's name its electricity consumption?

Not necessarily. Product names and advertised LED ratings may describe something other than actual electrical draw. Look for a clearly identified input-power specification or a suitable wall measurement, and label the calculation according to the evidence you have.

Can I use irradiance to calculate my electricity bill?

No. Irradiance describes optical power reaching an area, not the electrical power taken from the socket. Electricity calculations need input watts or measured energy, operating time and your applicable tariff. Keep optical dose and billed energy separate.

How do I calculate one session's cost?

Divide input watts by 1,000, multiply by session minutes divided by 60, then multiply by rand per kWh. The result is the variable energy cost for that session under those assumptions. Add any separately established standby energy when calculating a longer period.

Does a higher electricity draw mean better results?

No. Draw alone does not establish the light reaching the intended area, the suitability of a protocol or a clinical outcome. Compare relevant optical specifications and evidence separately. A cost worksheet is an accounting tool, not an effectiveness ranking.

Should I use the same electricity rate throughout South Africa?

No. Use the rate applicable to your supply and billing arrangement. Tariffs can differ and may depend on consumption bands or time periods. The illustrative rate in this guide is only a calculation example and should be replaced with your own current figure.

What if the manufacturer does not publish actual consumption?

Ask for the electrical input specification and its operating conditions. If unavailable, leave the estimate unresolved or obtain a suitable measurement without modifying the device. Do not substitute LED count, an adapter's maximum capacity or an optical irradiance claim without explaining the difference.