The Lotus Grand Prix Luxe appears to be a 1982 model only and is equipped the same as the earlier Grand Prix with the addition of second-generation LOTUS seat and down tube graphics plus brazed-on water bottle bosses, alloy rims and a Kashimax Anatomic saddle. The Grand Prix Luxe continues the use of the model name in the Edwardian script-style font on the top tube and uses Tange Champion tubing for it's frame.  Notice the chain guard on the crank, a feature found on most early non-competition model Lotus bikes. Interestingly enough, the Grand Prix and Grand Prix Luxe are equipped with large flange hubs, uncommon for a Lotus. 

The next model up from the Grand Prix Luxe is the Excelle.

For more information on the Grand Prix Luxe, please visit the Grand Prix page here.

The Lotus Grand Prix Luxe shown below looks a bit sportier with the brake extension levers, crank chain guard and rear spoke protector removed. This was, and still is, a common practice.  Hopefully the owner saved those parts as the correct replacements can be difficult to find. 

1982 Lotus Grand Prix Luxe
Frame Details	Top tube cable guides, bottom bracket cable guides, bottle bosses.
Frame Tubing	Tange Champion Cro-mo	Headset	Tange Chrome
Fork	Tange Champion Cro-mo 1/2 chrome fork	Handlebar	SR Alloy
Colors	Blue, Silver and ?	Stem	SR Alloy
Frame Sizes	19, 21, 23, 25 inches	Brakes	Dia Compe Alloy Side-Pull w/ QR, and Extension Levers*
Crank	SR Custom Alloy w/ Chain Guard 40-52	Seatpost	Stainless Steel
Pedals	MKS 2K Quill Alloy	Saddle	Kashimax Anatomic
Shift Levers	Suntour on Stem	Rims	Ukai 27" x 1.25" Alloy
Front Derailleur	Suntour VX Alloy	Hubs	Sunshine High-Flange Alloy
Rear Derailleur	Suntour VX-GT Alloy	Spokes
Freewheel	Suntour 6-Speed 14-32	Tires	IRC 27" x 1 1/8"
Chain	Shimano Uniglide	Weight	29 lbs.
Notes	*Many models observed with center-pull brakes.