Portable H₂O-Activated Magnesium Emergency Light - Product Review N72H
A Light When You Need It Most: The Portable H₂O-Activated Magnesium Emergency Light
When the power goes out, reliable lighting quickly becomes more than a convenience—it becomes an essential part of staying safe, calm, and prepared. Whether you are dealing with a storm, a natural disaster, a vehicle breakdown, or an unexpected household outage, having an emergency light that can operate for days is a valuable addition to any preparedness kit, survival kit, or disaster preparedness kit for New Zealand conditions.
The portable H₂O-activated emergency light is designed for exactly these situations. Instead of relying solely on conventional batteries that may lose charge over time, this innovative light uses a stacked magnesium–air power-generation system activated by water. According to the company’s specifications, it can provide up to 168 hours of continuous operation, or as much as 400 hours when used on a 12-hours-on, 12-hours-off cycle.
The company that produces just such an item contacted me and asked if I would be interested in stocking them on the webiste to sell, or if I was interested in a sample. I was of course interested, but the issue with samples if often that it costs about NZ$150 - NZ$200 for the over priced DLH postage, and then if the item is no good you are out a bunch of money for nothing. I have spent thousands on failed products for samples to test out, only to find they were poor quality or did not deliver on their promises. So, with that in mind, I turned them down and said I simply could not justify paying for an item via DHL when the risk was too high. To my surprise they offered me a couple of samples, sent via DHL, free of charge, and so I took them up on that offer.
First Thoughts | And Look At The H20 Activated Light
When you first get the Light, this is what it comes as. Packaging is basic, but bright and easy to ready, and the instructions were well set out. The light comes in a sealed bag which prevents any moisture getting into it and activating the battery, as long as it remains that way then it will be good to go. To be honest when I got the two samples, it was clear customs had opened one of them and the bag was cut, so I used that one as the first test model for the YouTube review.
The Package itself weighs Approximately 100 Grams and measures 13.5cm * 6.5cm * 2.5cm.
The Light Bulb is a Cree LED light bulb, and the output is said to be 0.5W. While this does not sound like much, in the dead of night, in an emergency shelter or in the midst of chaos, it is plenty. I was very suprised by just how much light it put out and how much of my room it was able to illuminate. The equivalent capacity on the Light is 3500mAh and it claims to run for at least 168 Hours once activated. The equates to 7 days of full run time on a unit. I assumed that once it was activated it would not matter if you turned it on or off, but on further investigation and on speaking with the company who makes them, they noted that it would run for around 400 hours if used on a 12 Hour on / 12 Hours off cycle. That would mean a run time of around 16 days. Of course it would start to wean off over that period.
Now the even more exciting or interesting part of this is while the name Portable H20 Activated Emergency Light, would seem to suggest that it can only be activated by Water, the company claims that in fact any liquidy substance can be used. I would suggest petrol is not one of them, but it could be regular water, salt water, urine, juice, black coffee and so on. Given I have two units, I am going to play around with this and see what I can get it to work with. So lets get onto the first test.
The First Test | Bottled Water and Eye Drops
With this product, the initial activation of the item requires the addition of 20mL of liquid into the port at the bottom of the light. You simply turn it upside down, and add water or liquid into the port, wait a few seconds and then turn it back up the right way. If you have added too much, then it will simply drain out the bottom of the unit. On one side is an ON \ OFF Switch and you simply turn it one and it is good to go.
The instructions noted that after 48 hours you can add a further 15ML of liquid to give it a boost. For my first test I started with 20mL of bottled water, and then after 48 hours, in line with the company noting it can be run off any liquid, I added some used expired liquid eye drops. The below picture is the filling port and above it is the kick stand which you can use to set it up on a table, or hang it off a hook for example.
The results from this first test were very encouraging: in my testing, the light continued running for well over 168 hours. It performed very well throughout the test and gave me confidence that the product could be a practical option for emergency lighting and preparedness kits. The test was carried out inside a room, with minimal windows where I work from, and I did a combination of on and off activation with it being on for the first 5 days all the time, and then on and off. I managed to get well over 16 days run time from it, with it still putting out enought light for me to make my way around the room at night time. I found the results very good, and decided to take a punt on the product and stock it on the website, so I am waiting on them to arrive in the next couple of weeks.
On the back of the unit, you will find easy to understand instructions.
One thing to bare in mind is that this was a personal product test rather than a controlled laboratory evaluation. The result should therefore be understood as an observation from my own unit and usage conditions, not as a guarantee that every unit will achieve the same run time with every liquid. For normal use, I would recommend following the manufacturer’s instructions and using the specified activation liquid wherever possible. In particular, users should not put unapproved substances into a device unless the manufacturer confirms that they are safe and suitable.
The test also gave me a useful first impression of the product’s convenience. The idea of storing an emergency light for long periods and activating it only when needed is appealing, especially in places where rechargeable batteries may not be regularly maintained or where replacement batteries are difficult to obtain.
The below is a view of the light on its side, and at the top is the on / off switch in black. It is a good size, and from using it, easy to use even when using heavy gloves like the kind you might find in a disaster kit.
Next Test: Radio, Strobe, and USB Charging Model
The company is also sending me a sample of another unit that uses the same magnesium power-generation technology. This model includes additional features: a radio, a strobe-light option, and they are also sending a portable power bank for USB charging which runs off the same technology.
I have not tested those functions yet, so I will report on them separately once the sample arrives. The follow-up test will look at how quickly the unit activates, how long it powers the radio and light functions, how the strobe mode performs, and whether the USB output is suitable for useful emergency charging. It should be an interesting comparison between a dedicated emergency light and a more multifunctional emergency power device.
This is what the light looks like when it has been activated, even though the light was on in the room, it put out enought light to dim the camera. I have done a video on it and so I will link that in here, and I will work on a better on which is shorter also.
How Magnesium–Air Power Generation Works
The technology behind this light is a magnesium–air generator. In simple terms, magnesium acts as the fuel at the negative electrode, while oxygen from the surrounding air participates in the reaction at the positive electrode. Adding a small amount of water activates the cell and allows the internal ion-conducting pathway to form.
Once activated, the magnesium anode releases electrons.
Those electrons travel through the external circuit, powering the connected electrical device—in this case, the emergency light—before returning to the positive electrode. At the positive electrode, oxygen from the air reacts with water and accepts the electrons, producing hydroxide ions.
Inside the cell, the hydroxide ions move through the battery structure and combine with magnesium ions. This produces magnesium hydroxide and completes the electrochemical discharge process.
In everyday language, the device turns the chemical energy released by magnesium into electrical energy, with water serving as the activation medium and oxygen supplied by the surrounding air.
The Electrochemical Reactions
The company describes the main reactions as follows:
Positive electrode reaction — reduction:
O₂ + 2H₂O + 4e⁻ → 4OH⁻
Negative electrode reaction — oxidation:
Mg → Mg²⁺ + 2e⁻
Overall reaction:
2Mg + O₂ + 2H₂O → 2Mg(OH)₂
These equations show the basic process: magnesium is oxidised, oxygen is reduced, electrons flow through the external circuit, and magnesium hydroxide is formed as the overall reaction product.
Activated by a Simple Addition of Water
One of the most distinctive features of this emergency light is its H₂O activation system. When the device is needed, water is added to activate the magnesium power cell and begin generating electricity.
This approach offers a practical alternative to traditional battery-powered lighting. There is no need to keep rechargeable batteries charged or worry about batteries being flat after long-term storage. When properly stored and ready for use, the light can be activated when required with a readily available resource: water.
The company describes the technology as combining long-term maintenance-free storage with immediate high-power output after activation. These characteristics can be valuable in emergency preparedness, where equipment may need to remain unused for long periods but still be available at short notice.
Users should always follow the manufacturer’s instructions for the correct type and amount of water, activation procedure, operating position, and safe handling.
Up to 168 Hours of Continuous Illumination
During a prolonged emergency, lighting needs can continue well beyond the first night. A short-term torch may be useful for finding your way around, but an emergency light with a longer operating life can support a household, campsite, vehicle, or workplace for several days.
When operated continuously, the portable H₂O-activated emergency light can run for up to 168 hours—equivalent to seven days of full-time use. This extended operating time can help provide light for essential activities such as:
•Moving safely through dark rooms or outdoor areas
•Locating emergency supplies
•Reading instructions, maps, or important documents
•Supporting communication and first-aid tasks
•Maintaining visibility during overnight outages
The exact operating performance may depend on usage conditions, activation, temperature, and the way the device is operated. Users should follow the product instructions and treat the published run times as manufacturer-supplied performance specifications.
Up to 400 Hours on a 12-Hour Cycle
For many emergency situations, the light does not need to remain on around the clock. By using a 12-hours-on, 12-hours-off operating cycle, the device can provide illumination for up to 400 hours.
This cycle-based approach can significantly extend the useful operating time of the power cell. It is well suited to situations where the light is used during active periods and switched off during daylight or when illumination is not required.
A 400-hour run time represents more than 16 days of operation on this type of schedule. For emergency kits, remote locations, and long-duration power outages, this can offer valuable reassurance and reduce the need to manage replacement power sources. Its also a great addition to Business Emergency Preparedness Kits or for Disaster Kits for Schools and other organizations.
Designed for Long-Term Emergency Readiness
According to the company, the stacked magnesium metal–air generator technology has been developed as an emergency power reserve system and is protected by multiple invention patents. Patent ownership and the scope of any granted patents should be confirmed through the company’s official documentation or relevant patent databases.
The company also states that the technology is resistant to low temperatures. This feature may make the device particularly suitable for emergency backup use in cold environments, including winter travel, outdoor work, remote locations, and regions where low temperatures can affect conventional batteries. As with all performance claims, users should consult the manufacturer’s technical data for the applicable temperature range and operating conditions.
Compact, Portable, and Ready for Emergencies
Emergency equipment needs to be practical as well as reliable. A portable light can be stored in a range of locations, including:
•Cars, trucks, and caravans Emergency Preparedness Kits
•Boats and marine safety kits
•Camping and hiking equipment
•Workshops and sheds
•Disaster-response and evacuation supplies
•Remote work or travel kits
Its portability means it can be taken wherever dependable light may be needed. Keeping one in an easily accessible location can make a significant difference when a power outage or emergency occurs unexpectedly.
A Useful Addition to a Preparedness Plan
A strong emergency plan usually includes water, food, first-aid supplies, communication equipment, and reliable lighting. The H₂O-activated magnesium emergency light can complement these supplies by offering a long-duration lighting option that does not depend on mains electricity or routine battery charging.
For best results, users should store the device according to the manufacturer’s guidance and check that it remains in good condition. It is also sensible to familiarise yourself with the activation process before an emergency occurs. Knowing how the light works in advance means it can be put into service quickly when every minute matters.
As with any emergency power device, the light should be used only as directed. Storage, activation, ventilation, water handling, disposal, and contact with the internal materials should be managed according to the manufacturer’s safety instructions.
Long-Lasting Light for Uncertain Situations
Emergencies are difficult to predict, but preparation can make them easier to manage. A portable magnesium power-generation device that is activated by water provides a simple and practical way to prepare for extended periods without electricity.
With up to 168 hours of continuous operation and up to 400 hours when used on a 12-hour-on, 12-hour-off cycle, this emergency light is designed to provide dependable illumination when conventional power sources may not be available.
Whether it is stored at home, kept in a vehicle, taken camping, or included in a disaster-preparedness kit, the portable H₂O-activated magnesium emergency light offers a useful combination of portability, long operating life, and water-activated power generation.
When the lights go out, preparation helps—and a reliable source of light can make all the difference. Keep your eyes peeled, for the next reviews to come when they arrive.