Miffonis' work was supervised by the Chief Engineer of the commission, William Patrick Anderson, a fervent promoter of reinforced concrete in the construction of lighthouses.

During the first three years of the commission, Miffonis developed and patented in 1908 plans for the design of tapered reinforced concrete lighthouses with flying buttresses.

[3] He received his education at the University of Paris during a time when reinforced concrete was revolutionizing the building industry in France and was considered the leading edge in its use as a new material.

[5][6] The Chief Engineer of the commission, William Patrick Anderson, was persuaded that reinforced concrete was the best choice for construction of future lighthouses in terms of solidity and costs.

The Assistant Chief Engineer, B. H. Fraser, mentioned that Miffonis was an educated man, possessing a grand culture and a great knowledge of mathematics and mechanics and one of the best theorists of the department.

[3] The hiring of the French engineer reassured the Department of Fisheries and Oceans about the use of reinforced concrete as a material for the construction of the new lighthouses erected at the beginning of the 20th century.

[9] Between 1909 and 1911, Miffonis produced plans and supervised the construction of three of the tallest lighthouses with flying buttresses, i.e., in Pointe-au-Père, in île Caribou, and in Estevan Point.

[3] In a section specifically addressing lighthouses, Miffonis mentions the advantages using of concrete, a material resistant to vibration and easy to form to a desired shape.

[3] Following Anderson's retirement in 1919, the economic downturn linked to the end of the First World War and the fact that the Canadian network of aids to navigation is now more complete, the functions of Miffonis were modified and few new lighthouses were built.

[14] Between 1921 and 1922, Miffonis, who then worked in the physics laboratories of Queen's University, carried out research on the optical qualities of various sources of lighting as well as on the reflective properties of certain materials likely to be used in lighthouses.

In 1923, he published an article in the journal of the Franklin Institute titled The sense of verticality and its application to lighthouse work that dealt with construction of tall structures, their resistance to wind, as well as the level of visibility of such buildings for those who look for them, especially according to distance.

[16] The next year, he published an article in The Astrophysical Journal about the construction of a device called a periodoscope, which is used to measure the period of a repetition of an event in astronomy when there is a limited number of observations.

[3] According to historian Brigitte Violette, the authorship of reinforced concrete lighthouse plans constructed in Canada between 1908 and 1914 has been subject to different interpretations.

[9] Furthermore, the description provided by Talbot in 1913 of the advantages of this method of construction regarding resistance to lateral wind forces and the solidity of the tower makes up the explanatory text that Miffonis wrote in his patent application in 1907.

[9] Miffonis' theoretical knowledge of the use of reinforced concrete leaves little doubt as to the importance of his participation in the erection of lighthouses at the beginning of the 20th century in Canada and to the fact that he is much more than a simple designer working for the Department of Fisheries and Oceans.

[15] The ten towers of less than 18.5 meters, built between 1908 and 1914, are of a "more sober" form, without buttress, providing a prismatic form over the entire length of the barrel:[15] the lighthouses of Flint Island in Nova Sotia (1908–1910), of the île Parisienne in Ontario (1912), of Point Atkinson, Sheringham and Langara Point in British Columbia (1912–1913), of New Ferolle in Newfoundland (1913), and of Natashquan and île Sainte-Marie in Québec (1913–1914).