Changes

Lamps can be made out of [[brass]], [[gold]] and [[iron]]any metal (confirmed by Oracle). When attaching the [[log]] to the [[lamp head]], it's the log that determines the success rate, and if you fail you lose the log while the lamp head is turned to a scrap. If you succeed to make a lamp, the whole log is used.

Lamps take 0.125[[kg]] of [[tar]] to fill to max capacity, and painting them takes 0.06kg of [[dye]]. Like a lantern, the higher quality they are the brighter they shine. Brass lamps are brighter than gold and iron lamps, although they cannot be painted. Silver lamps also shine rather bright it seems.