|Item Weight||2.6 pounds|
|Product Dimensions||5.9 x 13.8 x 94.5 inches|
|Item model number||GL02|
|Item Package Quantity||1|
|Type of Bulb||LED|
|Included Components||GravityLight GL02, SatLight, SatLight Power Cable, Zip Ties, Paper Bag|
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GravityLight GL02 Portable Self Powered LED Lamp
- Low Return Rate: 13% fewer returns than similar products
- Highly Rated: More than 80% 4 star and 5 star reviews
- Popular Item: Popular with customers shopping for "gravity light"
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CHOKING HAZARD -- Small parts. Not for children under 3 yrs.
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GravityLight is a unique and innovative device that generates light from gravity. This portable hanging lamp is simple to setup and provides instant light in any non-electrified space. It includes 2 LED lamps providing lamp brightness of up to 15 lumens. No batteries, no charging required.
From the Manufacturer
Hang GravityLight and fill the provided bag with up to 26 lbs. of weight. Pull the cord to winch up the bag and watch as it creates 20 minutes of light on its descent.
Need more light? Additional SatLight lamps can be connected to the main GravityLight unit to extend lighting. Multiple SatLights can be linked together (recommended max of 4).
Find what you're looking for
Bring light in to your garden
Endless light when the power goes out
Each purchase provides support for the GravityLight foundation to offer a clean, safe and affordable alternative to dangerous, polluting and expensive kerosene lamps, used by over 1.1 billion people.
Describe your product in 3 words.
Instant. Lighting. Always.
How did you come up with the idea for this product?
GravityLight was designed as a viable alternative to kerosene lighting for low-income, off-grid, households.
Globally, over 1 billion people live without access to electricity and rely instead on dangerous, expensive and polluting kerosene lamps for their home lighting - to study by, to work by, to cook by, all evening, every night. This number rises to over 2 billion people when you include families that have unreliable or intermittent electricity, who rely on kerosene when the power goes out, regularly, and for days on end.
Using kerosene for home lighting is really bad. The fumes are as harmful as those from smoking cigarettes, and children trying to study by it are heavily exposed from an early age. Unintentional ingestion of kerosene is the leading cause of child poisoning in the developing world. 30% of all burn cases admitted to hospitals in Nigeria were attributed to kerosene lamp explosions. A single kerosene lamp emits 150 kg of carbon dioxide per year and is a significant cause of black carbon. Added to this, it's a poverty trap - consuming up to 30% of earnings in low-income households; this for lighting alone.
We were moved to try and find a solution to this problem. This is how we came up with GravityLight.
What makes your product special?
GravityLight is unique. It contains no batteries, so can be stored for a long time without batteries spoiling or going flat. It works indoors, independent of the weather, time of day or season. It produces power for lighting on demand, with no pre-charge, for as many hours as needed, as long as the weight stays off the floor.
GravityLight is brought to you by Deciwatt Ltd. Every purchase of GravityLight funds The GravityLight Foundation in it's mission to eradicate kerosene lighting in the developing world.
What has been the best part of your startup experience?
The response, support and goodwill from crowdfunders has been overwhelming. The flow of kind messages that flooded in when we introduced GravityLight to the world was phenomenal. Now seeing GravityLight being installed in low-income, off-grid homes, and seeing GravityLight offer lighting and comfort to normally on-grid homes in times of distress or disaster, has made the whole enterprise incredibly fulfilling.
Top customer reviews
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This is intended to replace open wick kerosene lamps in places that don't have electric service. For that, it works very well. Solar with batteries would also work, but would require annual battery replacement. This will work for years without any intervention.
By first world public utility standards, the light is extremely dim. Compared with kerosene lamps, it's much brighter. Unlike kerosene, there's no ongoing expense, just the labor of raising the weight every 20 minutes. Poverty means you can't trade your labor for much value. This offers the world's poorest people a little light for a little lifting. That's a good deal. (BTW, I don't think they're the equivalent of $80 each in the third world.)
So why would a first world guy like me buy any? First, because these folks are doing a good thing, and doing it the right way. They have a good technical idea, and they're making a proper sustainable private business of it, not a charity, assembling in Kenya for the market there. Second, though L.A. has regular DWP power at the moment, a day will come when a major earthquake will take that away. Unlike battery solar systems, these can be stored for decades and should work when the need arises. Third, it's a novelty and a very well done job of engineering.
To use the device, you raise up the weighted nylon sack by pulling on one side of the orange cord (like a curtain shade adjuster). There is only one orange colored cord among a bunch of black cords, so i'ts not hard to find, and it's also not difficult to pull the 25lb sack up in this manner. As the sack slowly descends via gravity, it feeds the LED energy. This set also provides two separate mini-lanterns and 2 long cords, which you can hook to the "head" and then to each other, to make a string of 2 lantern lights (when the 2 lanterns are in use, the main head lamp does not turn on). This allows you to split the lighting, and to have the option to place lights closer to where you need them. Each of the 2 lanterns can be adjusted by twisting, for three separate lighting levels, so if you plug them in and they don't turn on, try twisting to turn them on. The two lanterns together at their highest levels are about the same brightness as the main headlamp.
Overall, I found this device to be a novelty and pretty cool as a concept, but a bit cumbersome in use- it's a testament to the good design that the cords on this device don't get tangled up, considering how many there are, and how closely they are placed together. On the other hand, you still just have a ton of cords, and it looks very messy and takes up a lot of space...and there's no way i'm taking this hiking. It'd be great for car camping though. I have solar lanterns that weight a few oz and run for 10 hours with 10 times the light as this GravityLIght. But, they still need sunlight and hours to charge. This GravityLight works instantly, and can be a lifesaver if you truly are out of options- no batteries, no wind-ups, no solar, no candles, no fire... this also overcomes the obvious and significant disadvantage of using up a non-renewable energy source, and then being SOL. So, I'd say this is good to have for your tool kit of available lighting options, either at a campsite, for emergency planning, or just as a conversation piece showcasing the clever engineering.
1.) It's not for everybody. What it does, it does quite well. Their stated purpose is to reduce dependency on kerosene for task light at night.
2.) Larger than expected. It comes shipped in an 11 x 9 x 6" fiberboard box, well packed. The box comes in at just under 4 pounds. Mine came inside an Amazon box. It would have survived most shipping carriers, including airport baggage handlers.
3.) I could not quickly find a place to hang it high enough in my house to get the claimed 20 minutes of run time. My response to that is 'so what', 12 to 15 minutes is not a problem. It looks like an 8 foot ceiling would be perfect for the GravityLight.
4.) The unit appears to be very well built. Without disassembling the unit, there was nothing which would be a failure point. The cords and beads are quite sturdy, the bag for the weights is exceptionally strong. The company's plastic people did an exceptional job.
5.) The light put out by the unit is, frankly, not what I am used to as a USA city person. About 15 lumen with a color temperature of 5000K and respectable Color Rendering Index of more than 70. It is more than adequate to read by and to do similar tasks in an otherwise dark area. I would not recommend cross-stitching on black aida cloth using this light.
6.) It will not charge a USB device. The nominal output is 2.7 VDC 0.031 A, 0.085 W. It was not meant to charge USB devices, get a solar charger if you need to, this will not do the job, it was not designed for that. It does provide adequate lighting to read and do other tasks.
7.) Pricing - I do not know the actual cost of kerosene in Kenya nor do I know how much lighting a liter of kerosene would provide. I cannot therefore provide a payback time for this unit for replacing kerosene. I can presume that the GravityLight would be infinitely better than the health risk of kerosene. Much better.
8.) Yes, I would buy it again and I would recommend it with caveats to others.