I can walk around the house in the dark with all the lights on things

That's exactly what made me do a count up Debster.

It's too depressing to walk around and count, but the answer is definitely "too many". The costs you calculated are astounding.

Far too many and I dread to think how many in my son’s room.
I do have a nice glow in the dark kitchen clock.

I've been pondering your observations. I'm more concerned about brighter lights. The 6 lights dotted down next door's driveway, their lights on their two storey stairwell which are blindingly bright, their two security lights on their garage and one by the front door. On my block of flats there's the 2 security lights one on each of the 2 garages, internal 24/7 lighting in the garages (could have windows but they've opted for wooden shutters). internal 24/7 lighting down our corridors (no natural light). Plus other security lights on other nearby properties and the street lights.

No dark skies round here.

I shudder to think! I do know I have been liberal with duct tape but even then it 'bleeds' out somewhere and there is always some glow or another.

Most of my stuff doesn't have LEDs, weirdly.

However, even if I did, they'd be outweighed by the streetlight that's outside my house. (Also the two gravel quarries around here operate 24-hours , so it's probably the antithesis of where you live - it's never dark here!)

Caroline - towns and cities are huge light polluters. A lot of energy could be saved by public education. It always amuses me that people say, "But I need these lights for security!" Lights actually make it easier for criminals to commit crimes after dark.

Lyle - hello stranger! I have been concerned about you as you haven't been around or posted.

We too have 2 whinstone quarries down in the valley, one of which works round the clock and used to have lights you could read a book by here, several miles away. Needless to say, that problem has now been solved by us BWs :) And last night, on our way back from a trip to the NW coast, we found what I believe to be the source of the only other bright light in the otherwise dark sky (actually, the only other light at all), a floodlight on a barn about 10 miles away, on the other side of the valley. I doubt they are aware of how far away it is visible, so I shall be tactfully enlightening them asap.

Gordon - As I said to the broadband installer, I worry about duct tape over lights. What if it overheats and causes a fire? But, it does seem to be the only option as most newer gadgets seem to have lights that can't be switched off now.

As well as duct-tape, you can also get "LED Blocking" stickers that'll reduce the light output by 50-80%.

They don't say how fireproof they are, but one assumes that a smaller sticker is going to cause fewer heat-related issues anyway.

Personally, I'd like to see towns and cities have night-time lighting wardens (similar to traffic wardens) who log which offices/commercial buildings have lights left on overnight.

The first time, a warning gets issued - for each floor of the building. After that, each subsequent offence incurs a penalty fine. (Possibly escalating with repeated infractions?)

I'm sure that companies would soon start enforcing a "dark office" policy if it began to hit them in the corporate pockets.

(Yes, there are some places that work overnight or whatever, but they can make some effort and register that fact for an exemption)

Totally agree Lyle.
I will admit that I read 'escalating' as 'executing'...

All commercial buildings should, in this day and age, all have lighting on movement sensors. A good start would be to have all toilets with lights on sensors.

But, it's easier to berate private individuals for eg not recycling enough than to do something about the really huge wastes of resources like this.