Production started as Chalwyn Lamps Limited, initially outsourced to James Croll Limited. In 1946/47 the company acquired its own premises in Parkstone, on the site of the liquidated Mass Products Limited, and set up dedicated production. Sales ran through Chalwyn Wild Limited in London until 1951, when the sales office closed and activities were concentrated in Parkstone.

In 1952 Nigel Page-Roberts, Hewitt's nephew and a toolmaker, found a factory site in Poole that had previously made Sten guns during the war — the existing presses suited lantern manufacturing well. Under managing director Jack Drewett, Chalwyn grew into one of Poole's largest employers. Early models from this period include the Tropic, Far East, Tempest, and Pilot.

Chalwyn's output peaked in the 1950s and 60s: production reportedly reached up to 50,000 lanterns a week, with around 30 million made over two decades. The company sold through some 120 agents worldwide, with main markets in West and East Africa, the French territories, the Middle East, and Ceylon — India, originally a key market, banned imports to protect local production. Models from this era include the Tropic, Far East, Tempest, and Pilot, later joined by the Lynx and Tornado — the Lynx was used by the Dutch military under the Kero name.

A South African subsidiary began production in 1954, taking advantage of local conditions; it was sold to South African shareholders in 1970.
Feuerhand was Chalwyn's main competitor, and its Lend-Lease-funded machinery let it produce more cheaply. Over time Feuerhand took the larger share of the global market. Chalwyn's position weakened further around 1955/56, when sterling became convertible again and European and Eastern Bloc competitors gained access to markets Chalwyn had held in West Africa, pushing the company toward smaller, secondary markets.

By 1961 Chalwyn had broadened well beyond lanterns, manufacturing and exporting oil-burning cooking stoves, domestic space heaters, and water heaters alongside hurricane lamps, and employed around 400 people.

As competition increased and it became clear hurricane lanterns had a limited future, the company widened its product range and changed its name to Chalwyn Limited on 1 July 1958. Through the early 1960s, lantern trade continued at a gradually reducing scale, but manufacturing was increasingly uneconomical as demand fell and competition pushed prices down. Hurricane lantern production at the Poole works ceased on 15 April 1970, though the company kept making road danger lamps into the early 1980s and continued supplying glass globes to East and West Africa.

The Chalwyn name continued through licensing and outsourcing after in-house lantern production stopped:

• 1970–mid-1980s: Chalwyn was the sole UK distributor for Feuerhand lanterns from Germany
• mid-1980s onward: lanterns sourced from the Czech Republic, with the Tropic and Far East names produced there under licence
• 1990s: Chalwyn also bought lanterns from a company in China, mainly for the African market, but logistics and quality issues eventually ended that arrangement
• Chalwyn continued supplying Czech-made Tropic and Far East lanterns to the home market for some years after, though rising raw material costs and Chinese competition were expected to bring that trade to a close once existing stock ran out

The main source from this information is the web site which is unfortunately taken offline roaddangerlamps.webs.com/lampephemera.htm (a 2007 account provided directly by Chalwyn to Dave Barden of the International Guild of Lamp Researchers) and Grace's Guide (gracesguide.co.uk/Chalwyn).