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UK to attempt to ban the sale of halogen bulbs.

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james_s:

--- Quote from: SilverSolder on June 11, 2021, 01:42:08 am ---Dimmed LED doesn't have the same attractive color temperature as incandescent, though.

I didn't know they still consumed 50% of "bright" power when dimmed...  seems a lot?

--- End quote ---

Well like I said, they do make some that attempt to mimic the effect, it isn't perfect but it's not terrible either.

It's been a while since I've taken actual measurements but I know I was surprised. Dim a 60W bulb down to where it's consuming 30W and it will be very dim. If I have a chance later I'll dig out a dimmer and a kill a watt and try it again.

james_s:

--- Quote from: coppice on June 10, 2021, 08:56:13 pm ---Lamps in modern ovens seem to fail quite quickly, even when you use the right bulbs. They used to last 10 years or more. I think they are moving the bulbs further into the oven and cooking them more. Even so, most ovens are still poorly lit.

--- End quote ---

I wonder if your ovens are worse than ours in that respect? Every oven I can recall seeing has a 40W appliance bulb in it, they're a fairly standard looking lamp, just physically smaller than the typical A19. They put it in a simple reflector on the back wall, every one I can recall has it in the upper-right corner under a glass cover. 10 years sounds about right, I think I've replaced mine once and the one at our cabin once, the latter doesn't get used much so it may have been the original from 1973. They're not incredibly bright but always seemed adequate for seeing what's in the oven.

Zero999:

--- Quote from: SilverSolder on June 11, 2021, 01:42:08 am ---Dimmed LED doesn't have the same attractive color temperature as incandescent, though.
--- End quote ---
Most dimmable LEDs remain a similar colour, when dimmed. There are special dimmable LEDs which reduce their colour temperature, when dimmed. It isn't a difficult effect to achieve. A high colour and low colour temperature LED, in the same package, with the appropriate controller would do the job. Search for dim to warm LED.


--- Quote ---I didn't know they still consumed 50% of "bright" power when dimmed...  seems a lot?
--- End quote ---
Yes, it's that bad, because efficiency of an incandescent lamp drastically falls, with filament temerature.

Nauris:
There is diagram about that in old Elfa catalog. It says that at 25% brightness power consumption is 50% but lifetime increases 300-fold

Zero999:

--- Quote from: Nauris on June 11, 2021, 04:53:18 pm ---There is diagram about that in old Elfa catalog. It says that at 25% brightness power consumption is 50% but lifetime increases 300-fold

--- End quote ---
Yes, it's a square law, if I remember rightly.

The increase in lifetime is outweighed by the drastically higher running cost. You're better off buying a 25W lamp, than dimming a 100W one to 25% of the brightness. The lamp will have to be replaced more frequently, but it will still work out cheaper.

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