LED light bulbs

SolStis86

I've seen a lot of posts here where people are unsure of what bulbs to buy when it comes to LED.

Found this site that has a visual guide to the socket types which could come in use:

lightrabbit.co.uk/base-selector

Tara100

NewtoDIY wrote: »

I think LED lights are fine for outdoors but I'd never used them indoors. There are known health dangers and plenty of literature about this online to read. Until someone develops a "safe" energy saver, I personally would go for halogen bulbs every time. They get hot but at least they don't emit radiation like all CFL bulbs do or suppress melatonin like LED lights.

Excerpts below taken from: Optical Safety Of LED lighting – CELMA - LightingEurope

Conclusions on ultraviolet radiation (UV)
LED based light sources do not emit any UV radiation (unless specifically designed for that particular
purpose). Therefore, they are not harmful to people with a specific sensitivity for certain UV radiation and
can bring relief to certain groups of patients. In this respect, LED based light sources provide advantages
over traditional incandescent, halogen and Compact Fluorescent lamps


Regarding melatonin disruption through blue light exposure:
Even though the spectra of LED, CFLi, halogen and incandescent lamps have different “typical shapes”, the
proportion of blue light does not vary much between lamps of different technologies with a similar colour temperature) and is always significantly lower than the blue (or UV) emission of daylight.

For all lamps intended for general lighting applications, the UV emission is well below the exposure limits as defined in EN62471.
LEDs used for general lighting are free of UV (aside very special types that are designed to emit UV)


Check out the graphs which compare the blue light exposure across all bulbs types too; I think you will be very surprised


Tara

Tara100

So...
The reason I came here

Asda are selling LED bulbs 3 for £15.
There's very little info on the site about them, so I wondered if any of you guys had any experiences with them / info about their reliability please?

Should I stick to a brand name? or could it be that like many consumables, these bulbs are made in the same factory as the branded types?

http://groceries.asda.com/asda-webstore/landing/home.shtml?cmpid=ahc-_-ghs-sna1-_-asdacom-dsk-_-hp#/search/led%20light%20bulbs

Thanks
Tara

savemoney

Doesn't seen to state how bright the bulbs are measured in lumen's only wattage so now idea how bright or how efficient they are per watt

Tara100

savemoney wrote: »

Doesn't seen to state how bright the bulbs are measured in lumen's only wattage so now idea how bright or how efficient they are per watt

Hmmm, same thoughts here.
I'm not sure whether to give them a whirl or not.

Biggles

The lumens figure is the large number at the bottom of the coloured 'sticker' on each bulb (you can see clearly, if you zoom the image, the word 'lumens' below the number).

Eg, the 12 watt bulbs give 810 lumens etc.

almillar

Well for the spotlights at least, they're 120 and 250 lumens, which is absolute junk, and not cheap either. You want at least 400 lumens to replace a 50W halogen, and remember to look at the beam angle too.
IKEA's LEDs look to be dim rubbish too.
A 100W traditional bulb is around 1400-1500 lumens I think, which can be done by a 25W ish CFL for £10. I don't think LEDs are there yet at a reasonable price...

RobGuggle

I've just started looking at LED's for my home. Only done a few testers so far. After a recommendation from a friend, who'd seen them praised in a blog, i bought 4 of these LED GU10 for my home office;

http://www.energysavingled.com/product/led-spots/6w-led-spot/

I'm pretty impressed although they do seem to be less yellow than the Halogens, but a good thing IMO. 400 Lumens and 60 degree beam angle. Not sure if they will be suitable for my open plan kitchen / dinning room / lounge though, i might need a wider beam?




Also just bought a 9w LED Bulb in Natural white and it's also very impressive. Again, i didn't want a yellowish light.
http://www.energysavingled.com/product/led-bulbs/9w-led-bulb/

Haven't taken any photos of this yet though.

Will gradually start replacing other areas of my home that has lights on too much with LED over the next few months.

Rob.

RobGuggle

almillar wrote: »

Well for the spotlights at least, they're 120 and 250 lumens, which is absolute junk, and not cheap either. You want at least 400 lumens to replace a 50W halogen, and remember to look at the beam angle too.
IKEA's LEDs look to be dim rubbish too.
A 100W traditional bulb is around 1400-1500 lumens I think, which can be done by a 25W ish CFL for £10. I don't think LEDs are there yet at a reasonable price...

I just replaced a 100w incandescent with a 9w LED Bulb at £10. I think it does a decent job although it's not as bright as the 100w. I didn't want 'warm white' which probably wouldn't have got close to doing the job, but Natural White does the job pretty well.

savemoney

I noticed Aldi had some leds in some went up to small bulbs 330 lumens they also had some larger bulbs for mains light unfortunately they were all screw type bulbs for mains light