The PH 5 was introduced as a classic new product and no one knew at the time that it would eventually become synonymous with the PH brand. Regardless of how the light is installed or the light source used, the PH 5 is and remains completely glare-free. The fixture was christened pH 5 due to the 50 cm diameter of the main shade. Henningsen wanted to improve the color reproduction characteristics of the light source in the PH 5. Small red and blue shades were therefore inserted to supplement the color in the part of the spectrum where the eye is least sensitive: the red and blue areas, thereby subduing the light in the middle yellow-green region where the eye is most sensitive. To mark the 50th anniversary of the PH 5 in 2008, the PH50 (a high-gloss version in five new colors) was introduced.
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