Both the Lampyere and w103f models are on show at Stockholm Furniture Fair, which takes place from 9 to 13 February.
For their most recent collaboration, she updated the successful w103 model, which was originally conceived as a table lamp.
Like tothe w103, the w103f features a hand-spun aluminium shade supported by a thin steel stand.
"The new floor lamp w103f is completing the existing range of table and pendant lamps named w103," said the designer. "Each of its elements are modular to allow different configurations."
These adjustable elements include a small disk-shaped platform that can be raised or lowered to serve as a table, and a light that can be screwed in a straight or a tilted position.
"The shade spreads a plain and calm light which gives a soft atmosphere, ideal for a large room or for a warm reading corner," said the designer.
Lampyre – first launched by Ligne Roset in 2007 – comprises a cylindrical base supporting a large conical shade, each made of translucent glass parts.
The brand describes the glass as "opaline" – a word coined to describe a decorative style of glass made in France from 1800 to the 1890s, featuring a cloudy appearance.
"The lamp glows inside equally from base to top, spreading a plain and calm light which can be very bright or be decreased to a halo with the dimmer," said the designers.
Sempé's collection for Wästberg is on show during Stockholm Design Week, which runs from 8 to 14 February 2016.
Other projects presented at the fair include a collection of mirrors with indented leather frames, rugs designed for a Texas art gallery and carpets that feature patterns based on London's textures.