I only use these in limited circumstances.. My goal is pretty much MORE likght, not cost. So an old fixture takes a 60W bulb... I put the biggest CFL that will fit, maybe I get 150W worth of light.
On my low-voltage track lighting, I have been using "halogena" bulbs (halogen/xenon) sinc ethe 35W bulb makes as much like as a 50W. That means I can put more fixtures on the track. I have an LED, too (4W), and if was not so damn blue, I'd replace 'em all with LEDs (my transformers are 300W, so the lower the bulbs, the more I can run on one circuit).
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