How can I tell the maximum bulb wattage if there is no label ?

Thanks, that makes sense. This is a quite large fixture that probably hung outside a pub or restaurant, so I'll try 100W and just keep an eye on it for awhile before committing.

hjp
June 2008

You can't really - the cable and bulb holder will be able to take the current involved more than likely - its the surrounding plastic or metalwork that may overheat. Aim safe - go for a 60w bulb if possible and its bright enough for you. If its a large item with plenty of space between the bulb and the glass or frame a larger bulb of 100w, maybe 150w should be ok. Why not use an energy saving bulb? If it will physically fit you'll have no problems regarding the wattage.

John
June 2008