We discovered STI products using the Internet. We needed to guard the fluorescent lights in our Scout Hall to comply with safety regulations and prevent accidental damage. STI's Light Damage Stoppers were cheaper than products from other manufacturers and they were delivered 'off the shelf' within 48 hours. They were easy to fit and, being coated in a gloss white polyurethane film, we find that they do not restrict the amount of light emitted. Their design also permits simple temporary removal in order to replace tubes and starters.