The French biochemist Pierre Calleja is the creator of this lamp powered by algae (micro-algae), which absorbs CO2 and produces light. The idea is to use this technology to replace traditional light bulbs in public spaces or garages. The first that was installed is in the 14th arrondissement of Paris, just opposite the Al├ęsia metro.

Its operation is completely independent of the electrical network. The logic of the process is to harness the photosynthesis of bright green algae for energy. The transparent plexiglass windows allow the algae to use some of the sunlight, while the LEDs, connected to the power grid, illuminate the interior to compensate for the lack of light necessary for the plants to survive.


The process takes place in a tube filled with algae which, thanks to a natural reaction, carry out photosynthesis, generating energy and luminosity, fed by CO2 from the external environment. each of these lamps will consume 1 tonne of CO2 per year.


According to the inventor, who works with his team in the company FermentAlg, each algae lamp is capable of absorbing, on average, one tonne of carbon per year, the same amount captured by 150 trees.


If modern architecture used this technology on the roofs and windows of buildings, technically they would plant thousands of trees that would purify the air.

photosynthesis lamp

The inventor’s suggestion is to use the system in common areas, to eliminate electricity expenses and help reduce local pollution levels. A system offers two important advantages at the same time.


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To allow new algae to grow, the algae will be regularly purged and sent to a treatment plant, where it will be used to obtain biomethane. Nothing is lost!

Algae is one of the sources of biofuel production such as bioethanol, biobutanol and biodiesel.