The units pass through the formula. Lux in results in Lux out. Likewise Lux-Seconds in results in Lux-Seconds out.
Stephen's 0.08 is "Lux-Seconds" because it is an amount of exposure given to the film.
You might be trying to find a suitable "Lux" as an amount of light that you will then expose the film to for a suitable time to arrive at the same exposure. (So you can take the time out of the equation, but somewhere you are going to apply time).