PSA: UL1994 Standard 4th Edition Published

UL1994 Standard 4th Edition Published

Underwriters Laboratories Inc recently published the 4th edition of UL1994 – Standard for Luminous Egress Path Marking Systems dated May 29, 2015. This new edition of ANSI/UL 1994 includes a revision to the Color Temperature Range for LED Activation Source in paragraph 33.2.3.

The LED-related details in Paragraph 33.2.3. now say the following in the 4th edition:


3) LED – Any lamp configuration, 4000 – 4500 K color temperature, seasoned for minimum 2 hours.

The Standard UL1994 is available for purchase at