For tasking light, it is important to choose a bulbs with a CRI level of 80 or above so you have better clarity of vision.
The CRI describes how well bulbs reflect colour to the human eye when compared to sunlight. Sunlight has a CRI of 100, so bulbs with a CRI of 80 or more will show colours accurately whereas those with lower CRIs will not.
The colour of light is measured in Kelvin on a scale from 1,000 - 10,000. The lower the Kelvin, the warmer the light and the redder it will appear. The higher the Kelvin, the colder the light and the bluer it will appear.
Bulbs that give off warm white light for ambient lighting are around 2,700K, whereas bulbs for brighter/cooler levels of light are around 7,000k.