I’m not certain, but I think that the Hikari Yoku – ‘temporary bath’ according to dear sweet Babel – is some sort of biorhythmic body clock adjuster which works by mimicking the sun’s rays. Trouble is, my Japanese is simply not up to translating anything which doesn’t include fish, rice, soy and wasabi.
‘It is convenient to the use with the healthy rhythm mode which does the helping which arranges the life rhythm of one day.’