My thumbs will fall off if I answer that. I sort of answered in another response you can read about Dark Bastard Amber (Rosco 03). Power Factor is why it's stupid to ban Halogen's and why LEDs are not as efficient as has been claimed. A Halogen bulb has a much higher CRI and power Factor of 1, a cheap LED has a Power factor of half of that (.5). That means the cheap LED uses twice as much current as the Halogen and can't come close to the Halogen's CRI. In commercial applications ( Like a stadium, for example) the power company charges on Kva demand and charges extra for Power Factor. That's because in real energy terms and on a commercial building's bill, a building full of cheap LEDs is way more expensive than the light it provides should be. So they often have to install capacitor banks on commercial buildings. And the LED needs just as much or more copper (Wire gauge/ breaker capacity) as the Halogen. All for a much shittier quality. Sure, encourage the USE of LEDs, go for it. But that old Twaine quote applies here: "don't ban steaks for men just because babies can't chew them".