Reddit mentions of Medium Base To Medium Base Light Bulb Socket Porcelain Extender / E26 1 Inch Extension Adapter

the light is emitted out the sides of your lamps and trying to reflect is out using something flammable like tinfoil will still be an exercise in frustration. Most of the light will reflect back in.

One possible consideration is to use a socket extender to drop the LED lamp down out of the fixture. If one is not enough try two. I like the porcelain ones best but the plastic ones are UL and cost less. https://www.amazon.com/Medium-Porcelain-Extender-Extension-Adapter/dp/B00TJ8YQ7W/ http://www.homedepot.com/p/Leviton-Medium-Base-Socket-Extender-R52-02006-000/100356980

This worked for me

Medium Base To Medium Base Light Bulb Socket Porcelain Extender / E26 1 Inch Extension Adapter https://www.amazon.com/dp/B00TJ8YQ7W/ref=cm_sw_r_cp_api_Rawyzb2DT8DJ5