Author's reply:

Kapton tapes are used in 3D printing and are widely available in electronic shops and e-commerce websites. Light Emitting Diode (LED) is a small electric component (about 2X3 mm). While the most effective way to control the harmful blue light is to paste the Kapton/polyamide tape directly on the electric component, you can also paste it on the plastic/glass milky white diffuser. To use it on a LED bulb, open the head of the torch and put the tape (1X1cm) directly on the bulb or on the plastic/crystal covering the LED (See image above).

This is to thank you for featuring our initiative. Following the publication, we have received numerous responses thanking and enquiring on how to procure and use the Kapton (polyamide) tapes.

MONTO MANI INDIAN INSTITUTE OF SCIENCE, BENGALURU