Guinness Launch "Guinness Light".  (M79)..1979..26.06.1979..06.26.1979..26th June 1979..At the Guinness Theatre in St James Gate Brewery,Guinness launched "Guinness Light". With a spectacular show Guinness brought to the market a new lighter version of its world famous stout. it is hoped that it will fill a niche with younger drinkers frequenting Ireland's pubs and clubs..Image shows (L-R), Clr William Cumiskey,Lord Mayor of Dublin,Lord Iveagh and Philip McGrath, Chairman, Dublin Licenced Vitners Assoc. accepting the new brew.