Looks like your CFLs are drawing 18 watts (1.5 amps at 12V) so they should be roughly equivalent to a 60 watt incandescent bulb. An LED will be better, but not substantially. I note that Defender shows a Dr. LED bulb for an E26 fixture, but its 120VAC, not 12VDC. I switched most of my lights to Imtra replacement bulbs over the last three years, Tried a couple, was happy, then switched the rest. But they are bayonnet sockets, not the large screw base.