thanks now I understand a lot...

I will ask the company how will they calculate the lump sum amount.  if they calculate using 6% or below or higher.  and how many years they use to calculate.  will the us treasury rate interfair the company's calculating rate?  Right now they us 6%.  but 3 year ago, they may used 1-2%?  if that is the case, one should take lump sum when rates are low, vs take monthly when rates are high at time of retirement (company has no inflation protection ).  I have not seen anyone mention treasury rate in the decision making process yet.