My pleasure!
Taking into consideration that an incandescent lamp of 40 W, emits 455 lumens, dividing that by 12
455 lumens/12 (one candle) -> 38 velas. (candles per foot)
A 100W-lamp would have 1750 lumens/12 ->145,83 velas (candles)
For a 60 W-lamp would be: 864/12 -> 72 velas (candles)
And a 40 W-lamp would offer a lightlevel of 455/12 -> 38 velas (candles)

Conversely (or the other way around, as they say), to turn footcandles (velas) into Watts would be divide 100 by 12 =
8,33 W (To incadescent lamps) Since fluorescent ones can save energy by a factor of 3, we would divide
8,33/3 = 2,78 W (close to 2 W or 3 W-lamp, fluorescents I mean).

Thus:

"Visual inspection should be carried out under a lighting level of at least 100 footcandles..."

Inspeção visual seria......sob uma iluminação de pelo menos uma lâmpada de 2 ou 3 W.

Ou 8,33 lumens, como queiram.

PP.