Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 163
ticularly the highvisual efficiency that is possible with it.It is said to lie less efficient per lumensgenerated than direct lighting, hut theabove-named advantages, combined withthe possibility of using powerful andeconomic lighting units, should compen-sate for the lews in absorption. 1… … We have many old churches with openroof trusses and low tie beams behindwhich lights may be easily concealed.The sketch (Fig. 10) shows this withincandescent gas burners and prismaticglass reflectors, hut acetylene or electriclight could be as easily adopted. Thisarrangement has already been…
Lighting
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