This is not just an efficient, high-quality LED light bulb; it can also be dimmed and has three different color temperatures.

Soft white sounds like it will be the whiter ... If, that is, you can figure out which one to buy. LED light bulbs are not generally labeled as “warm” or “cool”; that would be too easy.

Efficiency is the comparison of the amount of light (lumens) produced by a given amount of electrical energy (watts). The more the lumens per watt the more efficient the bulb.