Hillhead 2012
19 - 21 June 2012
International live demonstration show for the quarrying, recycling and heavy construction industries at Hillhead Quarry, Buxton, UK.
luminous efficacy
The ratio of the luminous flux emitted by a lamp to the power consumed by it.
Symbol: K
Units: lumens per watt (lm/W)
The monthly journal for the quarry products industry.