L−2⋅J Luminous flux per unit strong angle per unit projected supply space. Different improvements included the usage of a single lens in most lens trains, Portable display device making the unit lighter and extra environment friendly with regard to mild output, and a rotating barrel containing lens tube assembly, shutters, and accessory slot to permit increased precision in use of the shutters and/or Portable display device more easily registering gobos. It is an excellent system if you wish to entertainment or work on gentle tasks. In 1953 the club exhibited the 1840s work of Scottish pioneers David Octavius Hill and Robert Adamson (Hill and Adamson).
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