Multiply the LED wattage by 6 or 7 to get the incandescent equivalent power. I found the smd 36 led panel from ebay sellers (2010_led) was the same brightness as the 1141 bulb, then ordered the 48 led ones to get a significantly more light.
My DW is an artist, very sensitive to light colour. She likes the warm white white LEDs. As others have said, a good idea to buy one of several kinds and see for yourself before buying a bunch.
The cheap LEDs have no voltage regulation and will draw much more power when you are on shore power and the DC voltage goes up toward 14 volts. They get hot just like the incandescent bulbs and likely the lifetime is diminished. If you both boondock and use shore power, the LEDs that simply connect to the 1141 socket are an advantage - easy to swap back to 1141s for a few days. Mine are all soldered in but we always boondock.