By strobe effect, I mean, by way of an example, waving your hand under an LED bulb and watching it look jerky. I don't mean a bulb that is noticeably flashing on and off.
Can I still get 100w bulbs?
- Thread starter JD2012
- Start date
By strobe effect, I mean, by way of an example, waving your hand under an LED bulb and watching it look jerky. I don't mean a bulb that is noticeably flashing on and off.
As I recently said and illustrated, despite the way in which the LED elements are mounted,a substantial amount of light comes out of the lamp/bulb 'in all directions', particularly in the case of 'GLS-shaped' LEDs (probably less with candle bulbs).
One of the reasons is that, although mounted on a plat plane, the LED elements do not have a very narrow 'beam angle' -I imagine that it is not all that much less than 180°. Added to that is the 'bouncing around'(reflection) of light within the translucent envelope.
With a 'GLS-shaped' LED, even if one looks from 'behind the base', there is still a very appreciable light output ...
Of course, if there is a 'reflector shade' (as with some table lamps,w alll ights and downlights etc.), then the fact that the light all goes 'away from the base' is presumably a definite advantage?
Kind Regards, John
I was fairly slow to change over to LED, mainly because I found the colour temperature and rendition of most LEDs appalling. So-called warm whites were usually either green or lavender, depending on whether the excess blue was mixed with too much yellow or too much red.
About half a year ago I discovered Ikea‘s Solhetta LEDs and I‘m quite happy with the 60 and 100 W equivalents. I honestly can‘t tell the difference between one of those and an incandescent lamp. If anything, the LED feels slightly brighter than the incandescent it replaced.
I don‘t know about BC22 in the UK but you can definitely get pearl 100 W rough service lamps with ES27 base on the continent.
Regarding cost savings, I seem to remember reading that domestic lighting only accounted for 3% of the world‘s electricity consumption before the incandescent ban. That‘s not a whole lot.
About half a year ago I discovered Ikea‘s Solhetta LEDs and I‘m quite happy with the 60 and 100 W equivalents. I honestly can‘t tell the difference between one of those and an incandescent lamp. If anything, the LED feels slightly brighter than the incandescent it replaced.
I don‘t know about BC22 in the UK but you can definitely get pearl 100 W rough service lamps with ES27 base on the continent.
Regarding cost savings, I seem to remember reading that domestic lighting only accounted for 3% of the world‘s electricity consumption before the incandescent ban. That‘s not a whole lot.
On a less technical note, I have a small stock of filament lamps especially for use in my anglepoise lamp as the weight of any larger LED lamp is way too heavy and I have to add extra springs to stop it flopping down all the time. It would end up being a angle lamp without any poise!
People differ, but I believe I'm about as sensitive to strobing lights as you get. Many early LED bulbs and light fittings were terrible. Almost all current ones are absolutely fine and don't flash at all.
Stick to a known brand, rather than nameless junk or made-up brand names off amazon and all should be well.
Stick to a known brand, rather than nameless junk or made-up brand names off amazon and all should be well.
The next time that you wave your hand under LED lighting, check if it is a blur, or jerky. And then reference it by going outside in to the sunlight and repeating the above.
At a guess, I would say that 95% of the properties that I work in have a noticeable strobe effect when you wave your hand.
I‘ll try it when I get home but considering how slowly the aforementioned Ikea lamps dim to zero when turned off I doubt they‘ve got much of a strobe effect.
I also happen to use one of these in an anglepoise lamp without any weight issues.
I also happen to use one of these in an anglepoise lamp without any weight issues.
For UK homes it was around 10%-15% for lighting. It varies considerably based on the type and quantity of lighting installed and whether the property uses electric heating or some other fuel.
Incandescent to LED will cut lighting energy use by at least 90%, and around 95% for the latest types of LED, which will make lighting only 1 or 2% or so with no other changes.
For non-domestic, lighting is usually a lot more, 20%+.
However the savings for LED compared to incandescent are vast regardless of what percentage of the total lighting is.
A 100W lamp used for 1000 hours is about £27 of electricity - less than 3 hours a day for a year
a 10W LED only £2.70, saving over £24. Newer LEDs are only 6W or so for the equivalent lumen output.
The same applies to commercial installations but with much larger savings, which is why huge numbers of commercial locations changed to all LED years ago.
The change to LED lighting and the compact fluorescents before them is one of the main reasons why electricity consumption in the UK has been falling almost every year for the last 15 years.
Prior to LED bulbs, would have imagined that they, commercial properties, would have been using fluorescent tubes and not incandescent bulbs.
Interesting - despite the impact o EV charging and heat pumps?
I must say that I would have guessed t that even the relatively high electricity consumption of incandescent lighting would have faded into relative insignificance in comparison with those two additional significant demands on the electricity supply in recent times?
Kind Regards, John
Plenty were, but even there replacing with LED is at least at 50% reduction in energy use. More in some situations.
Yes. Electricity consumption down almost every year and in every sector.
There are efficiency improvements in most areas but lighting is by far the most dramatic.
source: https://assets.publishing.service.gov.uk/media/64f1fcba9ee0f2000db7bdd8/DUKES_2023_Chapters_1-7.pdf
Fair enough, even though the falls appear to have been relatively modest (and presumably due to a combination of factors).
Without some data, I cannot argue, but I remain very surprised, particularly in the most recent years, since I would have thought that the increase in EV charging alone would have more than compensated for reductions in energy used for lighting. It seems that, in the absence of knowing any 'numbers', my intuition may be wrong!
... but one needs to remember that, particularly in the most recent times,"efficiency improvements" is by no means the only reason for reductions in energy usage. In those 'most recent times' a fair bit of the explanation for reductions in energy usage (in all sectors) has presumably been due to the fact that that many people/companies have simply not been able to afford to do otherwise.
Kind Regards, John
There is a degree of movement judder under my LED lights that isn't there under sunlight. It's difficult to see but probably there, not over-sure though. But I can't generally perceive any flashing in normal use and everyday tasks.
I understand that LEDs are more efficient when pulsed, if it's a high enough flash rate you shouldn't normally notice. I'm happy with this compromise, I wouldn't want to pay a higher electricity bill just so that my hand didn't judder slightly when waved under a light.
- Joined
- 27 Jan 2008
- Messages
- 24,313
- Reaction score
- 2,777
- Location
- Llanfair Caereinion, Nr Welshpool
- Country
The MANWEB building Chester
Now demolished, but the heat from the fluorescent lights was thought going be be enough, but people working there did not agree, but heat from lights is only a waste if not required, and in the main lights used in winter a lot more than summer, that MANWEB building was the exception lights never turned off.
Of course when using non electric heating then cheaper to not heat with electric. But at end of day, average would change a bulb every two weeks with tungsten, and now around 2 a year.
Now demolished, but the heat from the fluorescent lights was thought going be be enough, but people working there did not agree, but heat from lights is only a waste if not required, and in the main lights used in winter a lot more than summer, that MANWEB building was the exception lights never turned off.
Of course when using non electric heating then cheaper to not heat with electric. But at end of day, average would change a bulb every two weeks with tungsten, and now around 2 a year.
When working with certain tools or hand sanding the strobe effect can be particular annoying.
Going very slightly off topic. Fluorescent tubes can make a spinning circular saw blade look stationary. I wonder if any LEDs flicker at the same frequency.