Dim as a Toc-h Lamp

any ideas to the this means....???

TocH was a charity, similar to the Salvation Army. It set up various troop facilities in WW1. If these were near the front line, then the outside lamp was very dim for safety reasons. Hence the saying.

There used to be - maybe still is - a 'Toc H' establishment somewhere near 'All Hallows by the Tower' (London England) that had a very dim lamp above the door: I took this to be a symbol of the organisation.