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Passivhaus suitable light tubes are now available from Lightway which combine performance and quality.
Unlike similar light tubes the Blue Performance range features a true thermal break with argon filled double or triple glazed panes set in to an insulation block achieving 0.6 W/m²K and 0.4 W/m²K whole system performance respectively. And like the full Lightway range they feature an external dome of high transmissivity sodium potassium glass and light tubes which are vacuum plated for greater reflectivity and longevity compared to film coated tubes.