Incandescent bulbs have just stepped into the 21st century. Energy regulations have limited the old traditional light bulb in recent years because of its inefficiencies – so much of the energy used to generate light is wasted as heat. Some brilliant minds from MIT and Purdue have developed an upgrade for the filament that allows the reclamation of energy lost via heat dissipation. They’re calling the new technique “recycling light.”
Physics professors Marin Soljačić, John Joannopoulos, and Peter Mermel, along with professor of power engineering Gang Chen, principal MIT research scientist Ivan Celanovic, and post-doctorate Ognjen Ilic, came together for the project. The team published the results of their work in Nature Nanotechnology.
The solution they came up with was a casing that keeps radiation from escaping the familiar metal filament. The casing is made of photonic crystal, which is earth-abundant. The crystal layers reflect a wide scope of infrared wavelengths that would otherwise dissipate as heat and turns them into visible light, hence the “recycling” name for the technique.
This not only increases the energy efficiency, but the luminous efficiency as well. Luminous efficiency describes the way the human eye responds to a given light source. Conventional incandescent bulbs are about two to three percent efficient, while compact LEDs are about 5 -15 percent efficient. Incandescents that use the new nanophotonic technology could hit 40 percent efficiency, according to the research.
The proof-of-concept units haven’t yet hit that number, instead peaking at about six to seven percent. That is, however, a significant upgrade over old incandescents. This development has broad implications for things other than bulbs. “The ability to control thermal emissions is very important,” Soljačić told MIT News. “That’s the real contribution of this work.” Devices that could use thermo-photovoltaic technology, like generators, could also be improved using the understanding of properties developed here.
Few things ruin a quiet evening faster than a robot vacuum roaring through the living room. Most of us end up pausing the cleaning run, which defeats the whole purpose of owning one. Matic thinks it has the answer with its new Serene robot vacuum, and the big selling point is how little noise it makes.
The Matic Serene runs at 52 decibels even when cleaning at full power. To put that in perspective, Matic compares it to the hum of your refrigerator. It is available now for $1,695, which is $200 more than the original Matic’s current price.
Outdoor security cameras are not always practical if you live in an apartment or rental. Drilling into an exterior wall may be off-limits, while pointing a regular indoor camera through a window can create another problem once reflections start showing up after dark.
Baseus is trying to solve both issues with the new PrimeSentinel W1, a $69.99 security camera designed specifically to monitor the outdoors through glass. It mounts directly to a window without drilling and uses a 4K Starlight sensor with an F1.0 aperture for full-color monitoring during the day and at night.
This post is brought to you in paid partnership with Best Buy.
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