I just replaced all my 4 foot fluorescents with LEDs.
I have 9 fixtures in my basement, 7 in my shop and 2 in the unfinished/storage part of the basement.
I initially bought two LED bulbs (one fixture's worth) of each of the following to compare:
- 16 watt, 1,700 lumens, 5,000K (Color temp) - Home depot ($19.97 each)
- 18 watt, 2,000 lumens, 5,000K - EarthLED.com ($10.49 each)
- 22 watt, 2,400 lumens, 4,000K - EarthLED.com ($12.99 each)
I used a an app on my cellphone that measures light (lumens) and held it at a constant work surface height to compare the different bulbs.
- As expected, the higher lumen bulbs put more light on my work surfaces (table saw, band saw, jointer, workbench, etc.)
- I also considered the color reproduction from the different color temps.
-- I thought the 5,000K bulbs produced more accurate color, but I also thought they were a bit harsher on my eyes.
In the end I selected the 22 watt, 2,400 lumens, 4K bulbs, ordered more and put them in my shop and put the other bulbs in the unfinished part of my basement.
The reason that I switched to LEDs is because I got tired of bulbs going out, going dim, humming, etc.
I also wanted to lower the amperage draw on that circuit (they're all on the same circuit) - so the new LED bulbs lowered the current draw by 2.3 amps (its a 15 amp circuit with two outlets on it in addition to the light fixtures).
FYI: I had to remove the ballast and rewire all the fixtures since the LED bulbs require direct 120 volt (not hard to rewire, but it required taking down the fixtures, rewiring, then remounting them - not that difficult, but a bit more work).
- I believe they make LED bulbs that will work in ballast'd fixtures, but I didn't want to do that for several reasons.
Hope my recent experience will be of help to you.