The PH Septima is regarded as one of Poul Henningsen’s most refined pendants. When it was exhibited for the first time as a prototype at the Danish Museum of Decorative Art in 1928, the poetic piece was publicly applauded. Based on Henningsen's three-shade system, the glass crown has four extra shades inserted between the three basic shades - all seven produced in very delicate, but robust, Italian borosilicate glass. The shades made of clear glass are treated to appear with alternating clear and frosted fields and are positioned so that the frosted fields cover the clear fields underneath, allowing the shades to spread the light in a more diffused manner while maintaining glare-free, downwardly directed light distribution.
The seven-shade glass crown emits a glare-free, downwardly directed light while radiating a pleasantly delicate glow. Frosted glass fields alternately cover the clear ones from shade-to-shade, thus diffusing the light even more softly.