Some of the falls in prices were due to end of the year sales, but the overall picture for 2015 showed that prices fell by 20 to40 percent.
Trendforce believes there is something of a recovery in December but Chinese manufacturers have over supply, and prices are expected to continue to fall during this year.
The UK market showed the biggest price fall for 40 watt LED light bulbs, with a drop of 6.8 percent during the month. The USA showed a drop of 3.6 percent during December.
Prices are now not far from a stage where it makes sense for people to buy LED bulbs rather than incandescent units.