  We combine the NLTE spectral analysis of the detached O-type eclipsing binary
OGLE-LMC-ECL-06782 with the analysis of the radial velocity curve and light
curve to measure an independent distance to the LMC. In our spectral analysis
we study composite spectra of the system at quadrature and use the information
from radial velocity and light curve about stellar gravities, radii and
component flux ratio to derive effective temperature, reddening, extinction and
intrinsic surface brightness. We obtain a distance modulus to the LMC of m - M
= 18.53 +/- 0.04 mag. This value is 0.05 mag larger than the precision distance
obtained recently from the analysis of a large sample of detached, long period
late spectral type eclipsing binaries but agrees within the margin of the
uncertainties. We also determine the surface brightnesses of the system
components and find good agreement with the published surface brightness color
relationship. A comparison of the observed stellar parameters with the
prediction of stellar evolution based on the MESA stellar evolution code shows
reasonable agreement, but requires a reduction of the internal angular momentum
transport to match the observed rotational velocities.
