and rejecting as excessive previous suggestions, e.g.:
Stereo Biological Microscope Bottom LED Backlight Light Source
.. a smartphone screen displaying bright white should suffice, e.g.:
https://blekenbleu.github.io/microscope/white.html .. using trivial html:
Code: Select all
<html>
<head>
<title>White light</title>
</head>
<body bgcolor=#FFFFFF>
</body>
</html>