Effective May 16, 2016

Standard Information
Standard Number:
UL 1598C
Standard Name:
Light-Emitting Diode (LED) Retrofit Luminaire Conversion Kits
Standard Edition and Issue Date:
1st Edition Dated January 16, 2014
Date of Previous Revisions to Standard:
2nd Outline Edition Revised May 31, 2011
Effective Date of New/Revised Requirements

Effective Date (see Schedule below): May 16, 2016

Impact, Overview, Fees and Action Required

Impact Statement: A review of all Listing Reports is necessary to determine which products comply with new/revised requirements and which products will require re-evaluation. NOTE: Effective immediately, this revised standard will be exclusively used for evaluation of new products unless the Applicant requests in writing that current requirements be used along with their understanding that their listings will be withdrawn on Effective Date noted above, unless the product is found to comply with new/revised requirements.

Overview of Changes:

UL 1598C was issued to include additions to the installation instructions and add LED driver requirements to the electrical construction. Specific details of new/revised requirements are found in table below.


Schedule: So that shipping of products with Listing Marks will not be interrupted, an approximate schedule has been established to ensure Listing Reports are found compliant by Effective Date:

  • September 15, 2015 = 8 Month Report Review – Intertek will review all Reports. Update if compliance is verified or issue Findings Letter/Quote for any re-evaluations needed
  • November 16, 2015 = 6 Month Quote Cut-off – Quotes returned for necessary re-evaluations
  • April 15, 2016 = 30 Day Warning – Client advised of all non-compliant Reports to be Suspended
  • May 16, 2016 = Effective Date – ATM Suspended for all non-compliant Reports

Fees: An initial review of Listing Report (s) will be covered by a direct billing project and will be invoiced at not more than $1000 per report.

Client Action Required:

Information - To assist our Engineer with review of your Listing Reports, please submit technical information in response to the new/revised paragraphs noted in the attached or explain why these new/revised requirements do not apply to your product (s).

Current Listings Not Active? – Please immediately identify any current Listing Reports or products that are no longer active and should be removed from our records. We will do this at no charge as long as Intertek is notified in writing prior to the review of your reports.

Description of New/Revised Technical Requirements

Addition to existing requirement is underlined below;

Power Supplies, LED Drivers, and Transformers

Addition to existing requirement is underlined below;

Power supplies, LED drivers, and transformers are required to operate within their rated input and output ratings.

Additions to existing requirements are underlined below;

Power supplies, LED drivers, and transformers are permitted to have more than one separate Class 2, LVLE, or LPS output.
19InfoInstallation Instructions 
19.1InfoGeneral requirements for all luminaire conversions 

New clause added;

LED retrofit kits that reuse existing components, such as lampholders, shall include a statement in the installation instructions that advise the kit installer to examine all parts that are not intended to be replaced by the retrofit kit for damage and replace any damaged parts prior to installation of the retrofit kit.

CUSTOMERS PLEASE NOTE: This Table and column "Verdict" can be used in determining how your current or future production is or will be in compliance with new/revised requirements.

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