Standard 1" fluorescent tubes are sometimes called T8s. T5s run from a special ballast, similar (but different ... You could save a few quid on replacement bulbs, though. Some T5 bulbs can be yours ...
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We tested both types of bulbs with the help of Philips and its light tunnel in Aachen, Germany, monitored remotely. All bulbs were burnt in to stabilise output before being tested. The bird’s ...