Looking for an alternative for the 500w halogen floodlight as I am
currently working outside and its stiil getting dark early. Saw this at
screwfix and although nowhere near as powerfull thought that it might
come in usefull,
http://www.screwfix.com/app/sfd/cat/...95515&id=19417.
It says it has a long-life 2D lamp. 38W = 150W GLS. I am assuming GLS
is the equivilent to a standard tungsten bulb but wondered what GLS
meant, and why is the energy savng bulb measured in a different way,
i.e why is the output wattage lower for an enery saving bulb or why is
it measured differently?