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Seoul Limits Brightness on Large LED Billboards for Energy Conservation

4/1/2026

Summary

Story summary

The Seoul Metropolitan Government announced guidelines to limit brightness on large outdoor LED billboards, effective April 1, to reduce energy use and address concerns in COEX and Myeong-dong.
The regulations apply to displays 30 square meters or larger, with daytime brightness not exceeding 7,000 candelas per square meter.
Night-time limits vary by size.
Medium billboards must stay under 500 cd after sunset.
Large billboards must stay under 400 cd.

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Story summary

The Seoul Metropolitan Government announced guidelines to limit brightness on large outdoor LED billboards, effective April 1, to reduce energy use and address concerns in COEX and Myeong-dong.
The regulations apply to displays 30 square meters or larger, with daytime brightness not exceeding 7,000 candelas per square meter.
Night-time limits vary by size.
Medium billboards must stay under 500 cd after sunset.
Large billboards must stay under 400 cd.