Already answered, and yes, the color temperature does make a big difference.
Wife does a lot of fine work, and finds the 5K LEDs are great for that. Lower temp at the same wattage looks and feels like less light.
The little w is for watts. The higher number is a rough equivalent to lumen output, the lower one is the power that bulb consumes.
My workshop has 8' fluorescents .. you can't get them inside a curb trash can, so when I replaced them, I just saved them up till I had several and then busted them up with a hammer inside the trash can .. no breathing protection, nothing .. probably went on for 20 years .. I'm now guessing I must have built up my arsenic immunity over the years ..
Not sure about arsenic in fluorescents. They DO contain mercury, hence the cautions and (technically) recycle laws. But if you weren't doing that on an industrial level, probably not a concern.
More to the point here in the US, 100 watt and, I believe, 75 watt incandescent bulbs are illegal to make or sell. So if that much light is needed, other ways have to be found. CFLs have had a nice run, still have many going in our house as we started the change-over before LEDs were anywhere near what I was willing to pay for a light bulb.
As they start to die (DO recycle them - Lowes, Homely Dopes and other places take them -- any place that sells them is required to accept them for recycling, but some are easier than others) and I finish off my stash, we'll be going LED. Even lower power bills and longer life than CFL.
For most of our purposes, we like the 5K temp. Yes, a white, bright light. Excellent for close work, reading, coiling.... not so good for that romantic atmosphere
