Measurements: Ikea Ledare 1000 lumen, 4000K and 5000K variations

Found some relatively inexpensive (10 € a piece) natural white E27 LED lights from Ikea. Both models, 4000 K and 5000 K, are advertised as 1000 lumen. I don't have an integrating sphere, so cannot confirm that, but did some measurements that can be found from an imgur album here:

http://imgur.com/a/ucXth

Both lights measure a bit below their advertised color temp, the 5000 K model more so. CRI of 83 is better than specified (80). Power draw is 10 watts for the 4000 K model and 12 watts for the 5000 K one.

They do get very hot even when positioned in a way that hot air can escape upwards. After one hour i measured 80-90°C. As the temperature goes up, the output goes down: down to 82 % after one hour (vs. 30 seconds after lighting them up). Behavior is identical on both models. I wouldn't place these lights into an enclosed lamp shade without a dimmer.

Also, the color temp goes slightly up as the lights heat up. The spectrum gets ever so slightly more even at the blue region which shows up as a one point increase in CRI for the 5000 K model. The tint is nice and neutral to my eyes and there's no pwm. I am happy with the lights for the price.

Product pages (in finnish):
http://www.ikea.com/fi/fi/catalog/products/70287254/
http://www.ikea.com/fi/fi/catalog/products/50287170/

We need more 4000k bulbs.

maukka said:

Found some relatively inexpensive (10 € a piece) natural white E27 LED lights from Ikea. Both models, 4000 K and 5000 K, are advertised as 1000 lumen. I don't have an integrating sphere, so cannot confirm that, but did some measurements that can be found from an imgur album here:
http://imgur.com/a/ucXth

Both lights measure a bit below their advertised color temp, the 5000 K model more so. CRI of 83 is better than specified (80). Power draw is 10 watts for the 4000 K model and 12 watts for the 5000 K one.

Click to expand...

It has measured 1134 lumen.
http://fastvoice.net/2014/10/03/doppeltest-mueller-licht-hd-led-contra-ikea-ledare-birne/

MattPete said:

We need more 4000k bulbs.

Click to expand...

There are more than 30 available, in germany even more than 50.
http://www.idealo.co.uk/cat/9192F89...nt=50&param.resultlist.sortKey=minPrice&q=LED
http://www.idealo.de/preisvergleich...=true&param.resultlist.sortKey=minPrice&q=LED

4000k is as rare as hen's teeth in the States. If you walk into a store, your choice seems to be either 2700k or 5000k, with nothing in between.

MattPete said:

4000k is as rare as hen's teeth in the States. If you walk into a store, your choice seems to be either 2700k or 5000k, with nothing in between.

Click to expand...

Have you looked at an Ikea?

FroggyTaco said:

Have you looked at an Ikea?

Click to expand...

US Ikea site has only the 2700K.

http://www.ikea.com/us/en/catalog/products/30257485/

Bummer. I just assumed US got the same spec bulb.

The Finnish Ikea site only had the 4000 and 5000 K versions appear a couple of weeks ago although they were already available in select locations last summer. So they might exists even if not listed online.

I still scratch my head as to why all the US bulb makers settled on 5000k as a complement to 2700k. I can't think of anyone who liked 5000k when it from CFLs (and indeed, many people who didn't know what color temperature meant who bought 5000k bulbs hated them). They just look awful in all but exceptional circumstances. 4000k, or even something like 3500k would be a vast improvement.

I think I read somewhere that this was because 5000k was easier to get to an 80 CRI than a 4000k bulb, but I never found this explanation convincing.

MattPete said:

4000k is as rare as hen's teeth in the States. If you walk into a store, your choice seems to be either 2700k or 5000k, with nothing in between.

Click to expand...

There's a Cree LED-bulb with 4.000K:
ledbenchmark.com/display.php?id=126&name=Cree,+Inc.+9W+Dimmable+DW+Globe

The first bulb I bought was a Phillips Airflow BR30 in 5000k (by accident). When I first installed it over the island in our kitchen, I thought "ew, I'd better take this back". But then I had flashbacks to the flourescent in previous kitchens, and I decided to stick with the higher color temperature to see if I might like it.

My next bulb was a Lighting Science Br30 (GP30?) in 4000k. I put it in the can next to the Phillips, and it is noticeably warmer (the rest of the lights around the perimeter of my kitchen are 2700k BR40s). To me, 4000k looks like white light with just a touch of warmth: the color of an afternoon sunbeam coming through the window on a winter day.

If it was up to me, the lighting in my house would be between 3500k and 4000k.

angerdan said:

There's a Cree LED-bulb with 4.000K:
ledbenchmark.com/display.php?id=126&name=Cree,+Inc.+9W+Dimmable+DW+Globe

Click to expand...

I tried one of those in a basement light fixture and took it home immediately. It was very blue and made everything look...weird. I have 4100k and 5000k fluorescent T12s in another room in the basement, and they looked far better.

Can you measure Flicker % for these lamps ?

It is 100 Hz, but not visible, since the amplitude is low.

DC coupling (horizontal center line 0 lumens):


AC coupling (zoomed in):

I like 3200° and 3400° K.

angerdan said:

There's a Cree LED-bulb with 4.000K:
ledbenchmark.com/display.php?id=126&name=Cree,+Inc.+9W+Dimmable+DW+Globe

Click to expand...

They aren't even close. I have a few different 4000k and 5000k bulbs.

Go to home depot and get the 4 pack for 11usd...2700k. Or do what Im planning and get Hi cri boards to wire into fixtures