LED-tubes are direct replacements for fluorescent tubes, but do not need ballasts. Thus, LED-tubes can be used in existing fluorescent fixtures (once ballasts are removed), and save about 75% electricity compared to the fluorescent tubes. There are numerous manufacturers, the LED-tubes have 4-6 times longer lifespan than fluorescent, and contain no mercury. The only downsides are: the upfront cost, which is substantially higher than simply buying more fluorescent tubes (currently around $100/pair); and the labor to remove ballasts. The lifecycle energy savings and four or five fluorescent replacements (and hazmat disposal/recycling) currently make the changeover about an even exchange.
Idea No. 530