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The most popular and versatile method for achieving a dark period is through the use of red-coloured laser goggles (colloquially known as "DP goggles" in the [[Special:MyLanguage/Polyphasic Sleep Discord|Discord community]]). There are several types of these available, and below is a comparison between their light-filtering lens tints:
The most popular and versatile method for achieving a dark period is through the use of red-coloured laser goggles (colloquially known as "DP goggles" in the [[Special:MyLanguage/Polyphasic Sleep Discord|Discord community]]). There are several types of these available, and below is a comparison between their light-filtering lens tints.
{{note|The data and the links here are sourced from online stores on Taobao and other websites, but not all have been confirmed by the editors here. The data has also not been independently verified by ourselves, and the Wiki makes no guarantee of validity of this data.|warn}}
{| class="wikitable"
{| class="wikitable"
|+Comparison of commonly available red goggles (links not sponsored)
|+Comparison of commonly available red goggles (links not sponsored)
