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Customer Review

2.0 out of 5 stars LED corn lamps, 14 Mar. 2014
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This review is from: E27 9-10W 60x5050 SMD 1100LM 4000-4500K Natural White Light LED Corn Bulb (220-240V)
Far too blue for domestic use - the comparison with the previous CFL is stark, I don't think 'cool' is a fair description. (Another from ebay labelled as warm white is significantly yellow and makes human faces look jaundiced.) Until we can be convinced the output is similar to CFL or tungsten I won't buy any more. The technology just isn't advanced enough yet obviously.
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Showing 1-1 of 1 posts in this discussion
Initial post: 5 Jun 2014 15:47:57 BDT
Last edited by the author on 5 Jun 2014 16:04:09 BDT
Michael K says:
I've experimented with quite a variety of LED lighting in the past few years.
I am therefore surprised that this lamp is specified as "natural white" if its colour temperature is specified as 4500 Kelvin. That is not natural light, though it's certainly not yellowish like 2,700K, which is like incandescent lighting.
No wonder you weren't happy with it.
In the kitchen I use spot lamps varying between 3 watts (just one of those over the kitchen sink) to 6 and 9 watt units. which are around 6,000K,and they make colours look quite natural, somewhat akin to the light of midday sun. It's very nice to have that kind of lighting, especially on short winter days and nights here in the UK.

One also has to bear in mind other factors.

Angle of dispersion, particularly with spot lamps. This can be as narrow as 30º (less in rare cases) to the more common 40º and 60º spots.
Then there are those using SMDs (surface mounted devices) often used in "corn" lamps, because they slightly resemble a corn cob, that can spread the light quite uniformly and over a much wider angle. That's what is shown here.
So you need to determine how far away from the surface or objects which are to be illuminated and whether you want the lamp to highlight or add a more diffuse lighting.

Also of importance and especially related to cost and potential savings is thermal dissipation capacity. Some of the spot lamps can fail WAY before their LEDs would, because of cheap electronic components and especially because the thermal dissipation capacity of the metal jacket is not up to handling the heat generated by, for example, a 9 watt lamp. Yes - LEDs are far more efficient, but they still generate heat which needs to be effectively dissipated.
Corn lamps with their arrays of SMDs, placed circumferentially on the lamp's surface, can better dissipate heat, though again, many are made with inferior electronic components which can drastically shorten the lifetime of such a unit as a whole.

You may find the following table of use:

Name of White Kelvin Color Temp. Comparable to a:

Warm White 2700-3500 Kelvin typical incandescent light bulb

Natural White 4000-4500 Kelvin typical retail space white fluorescent lighting

Day / Daylight White 5000-6000 Kelvin used for high color definition - typical noon day sun in many parts of the world

Cool / Commercial White 6000-7000 Kelvin used in many industrial and commercial applications like hospitals.

I would suggest trying something around 6,000 K, though, again, you may find it a bit too bluish for your liking.

I should add, we also use warm white LED corn lamps in a few locations (20 watt units), which provide a sufficient quantity of light (unless one desires something almost blindingly bright), that serve well in a bedroom or living room. I don't find them too yellow, but you have to ensure they are the right colour temperature. Ours are about 3,000 - 3,500 K. It seems to me you'd probably be more satisfied with that.

There can be other details, but these are probably the most important points to be aware of.
Hope this is of some help. :-)

Michael
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Location: Lincoln, UK

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