The type 2A was a high-candle-power lamp made by Davis of Derby. One of the key features of high-candle-power lamps was the introduction of the combustion tube. This additional glass tube surrounded the flame, aiding combustion to produce a bright white flame. The Haydock Pattern lamp used a tube patented by Haydock and Naylor.
Improvements to the fuel combined by the new design meant that the No.2 could produce around 4-5 candlepower of light.
In order to compete with the influx of electric lamps, flame-safety lamp-makers began to develop high-candle-power (HCP) lamps. They were larger lamps, often with elaborate bonnets, that produced considerably more light. Even the most effective standard lamps could only produce light equivalent to about one candle (one candlepower). HCP lamps could produce between four and six candlepower.
