Rooms can be as bright as the outdoors
I usually eschew labels, preferring simply "sleep weirdo", but I fit the pattern of "Non-24 Sleep-Wake Disorder", with my sleep and waking times drifting progressively later at semi-regular intervals.  The result is that I'm often awake through the night.  (This week I'm going to bed around 9:00 a.m.)Even with that, I've noticed some pretty big productivity swings based on the season.  Interestingly, this hit me very hard in moving from where I'm from (southern Texas) to Michigan (for college) and then to Berlin (for the last 14 years).  Right now, in Berlin, which is approximately as far north as Edmonton, Alberta, Canada, North America's northernmost large city, the sun sets before 4:00 p.m.I usually try to spend a month of winter closer to the equator to keep my productivity levels and spirits up.Between the seasonal adjustment (where the sunset time swings by a full 7 hours in Berlin) and my sleep weirdo-ness, I've also come to love me some artificial-sun-level lighting.I tend towards 400-500 watt halogen bulbs.  I have an up-firing light of approximately that wattage in every room of my home.A question for other folks that compensate sunlight with artificial lighting:Do LEDs really work for you?  I'm a wanna-be hippie, and I'd love to use energy efficient bulbs and have tried every generation of them, but the light just doesn't do it for me.  I keep going back to halogen as the sweet-spot between black-body radiation and energy efficiency.  I can immediately spot the difference between an LED or CFL and incandescent bulb.  I've had some success in mixing them in about 50/50 ratios.  They've already been banned for sale in the EU, but I have a stockpile that will last me a decade in a pinch.  Does anyone else struggle with the light quality from modern lighting?