Check out the chart. You want daylight or grow bulbs for veg., not cool white. Cool is in between what we want for either veg or bloom. For bloom we want grow bulbs since they have 6 times more of the red spectrum needed for big juicy nuggets.

Ultimately you want to check the package, visit the website, or call them. Don't buy any bulbs for veg that don't have a high percentage of blue, and don't buy any for bloom that don't have a high percentage of red. The scale for this is K for Kelvin. Veg we want 5500K. Bud we want 2200K.

And how many? One will keep 2 plants alive, but I would want at least 4. The more you can cram in there the better.