Omnidirectional LED light bulb is OK?

[vikasbly44]

DEAR....

It depends on the lumen output of this LED bulb, but if it will have a lumen output higher than 1200 lm it will be brighter..
Thank you...

 

[chuckey]

We have 10 down lighters in our kitchen, installed by the previous owner. These I have replaced with LED bulbs. One severe problem is the fact that they are down lighters, the top 500mm of the walls and the ceiling are un-illuminated and so look dismal.
I was thinking that a Fresnel based prism cover could be used to throw some light out side ways, so illuminating these areas a bit.
Frank

 

[betwixt]

I just purchased some LED replacements for incandescent 'candle' lamps and found they perform really well. I'm puzzled at how these particular ones work though. They have E14 bases which is too small to house any significant electronics, specifically any sizeable electrolytic capacitor and the LED is shaped like a conventional filament. It looks like a thin strip, about 1 x 25mm and is coated in what looks like the same yellow paint used in normal white LEDs. It has a turn on time of about 0.5 second and turns off instantly so there must be some electronics in the base, presumably using a HF ballast. What makes it different to other lamps is there is no heat sink whatsoever and no reflector, the light seems to come from under the paint layer. It has almost perfect 360 degree light output. I'm not sure how the LED itself is fabricated, maybe lots of series junctions along the strip to spread the light better and build up the voltage needed to drive them. Can take a photograph if needed.

Brian.

 

[Audioguru]

I saw some LED bulbs from Philips that look like a thin ribbon that glows. They are VERY expensive but will last longer than me.

 

[betwixt]

This is the LED lamp, there is a tiny circular PCB in the base, I can just see it through the glass but it is only ~10mm diameter and has the glass center support passing through a hole in it's middle. Claimed output is 250lm and power rating is 2.2W @ 240V. The price was 6.00 UK (about $11.50 Canadian). I'm putting the finishing touches to my new house and to comply with new regulations, the lighting all has to be low energy so it is worth my while paying the extra for LEDs.

Brian.

 

[treez]

Thanks Betwixt, that really does seem to be the most novel (and effectively so) LED bulb I have ever seen. That strip form of LEDs looks extremely unusual....and the lack of room in the base for significant electronics.
I find myself wanting to buy one and soak test it, leaving it on incessantly to see how long it can last.

Actually ive found it here...
https://www.youtube.com/watch?v=25j2C4jq2HI

 

[Audioguru]

The DC voltage inside the LED bulb was tested as 150VDC but with no load. It might be 120VDC with the LEDs loading it down. The "filaments" show maybe 40 tiny LEDs in series.

 

[betwixt]

An interesting technology though. I very much doubt the base of my E14 lamp has enough space to fit even a single electrolytic so it can't use the same ballast as the one Treez found on Youtube. I would snoop around it with a spectrum analyzer but mine is still unpacked since rebuilding the house.

I bought the lamps from B&Q in their Aberystwyth store, they have the name "Diall" on them which I think may be one of B&Q's trademarks. For those outside the UK, B&Q is a giant DIY chain with outlets in most major cities (and Aberystwyth which is definitely NOT a major city!).

Brian.