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Image from Davy's website

Or see their main site at Innolumis.com.

The Lumis LED product is available in either Lumis Mesopic Green or Lumis EcoWhite. Both light outputs are produced by a combination of green and red light outputs from the LEDs, with the latter featuring a greater red content to improve colour rendering. EcoWhite is therefore more appropriate in most locations, but where colour is not really important (cough, SOX), Green can be chosen, and is slightly more efficient due to the spectrum. Green is available in 8w, 14w and 22w sizes, and EcoWhite in 16w, 24w and 36w sizes. The products are supposed to be able to last for 20 years with <10% lumen depreciation and only basic cleaning cycles required. Suggested mounting heights are between 4m and 8m, and there is suggestion on the website that 36w LED could replace 70w SON.

In the Netherlands, there are projects that have seen 16w EcoWhite installed at 5m height (Dutch would normally use 24w PL-L at this sort of height), and 36w EcoWhite installed at 8m height. However, thanks to a discovery on Davy's website, I discovered that Plymouth is trialling the 24w EcoWhite version on 5m columns lighting a footpath, replacing the previous 36w PL-L WRTL Libras. As a side note, why must councils insist on replacing new lanterns with new trial lanterns? Why can't they replace 30 year old lanterns with new trial lanterns and get better value for money?

Hmm, very interesting and at last some science being applied once more to lighting. The green light almost harks back to low pressure mercury before MBF came along. Interesting that they say colour recognition is still possible. With low pressure mercury people "complained" that the colour was too blue. With green and red leds the light moves towards the warmer part of the spectrum which improves colour rendering.

Personally I feel that "white" leds are too cool a light and that they need mixing with other colours to produce a warmer light, especially for use in the home.

Interesting to see they have been trialed in London near Tower Bridge and Glenlea Rd. The latter example shows how much better the colour rendering is compared to SON. With Hampshire and now Surrey specifying CFL in their PFI for residential areas it looks like the march of SON could well be halted. Could these areas later change to led as the technology matures? It looks like Plymouth and some London boroughs are evaluating this lantern with that in mind.

It looks like the Plymouth trial was to evaluate the lantern with the "green" light in a more "rural" location as explained in the data sheet, hence the use on a footpath.

There certainly is more science. Reading through some of the PDFs on the Innolumis website shows this. There is the suggestion that at night time green light offers the greatest visibility and clarity. However, monochromatic green light has the same issue as SOX, and that is the fact that it is monochromatic and does not have any colour rendering. The introduction of red into the spectrum brings out the yellows and reds of objects the light falls onto. Lumis Mesopic Green uses some red within the spectrum, but is still visually very green light, just with a slight amount of colour rendering added in for good measure. Lumis EcoWhite increases the red content further, and whilst the light output is technically less efficient the colour of the light is much more acceptable. Of course, all colours of the spectrum can be produced from red, green and blue, and given how ineffective the blue end of the spectrum is with regards lighting at night time, it is neglected from the LED modules.

Looking at example pictures, the EcoWhite appears to be a very acceptable colour of light. The Mesopic Green just looks very green! Going back to installations, take a look at this image from this web page:



On the left is 36w EcoWhite (total circuit power 43w), and on the right is 70w SON. The sky isn't completely dark in the picture, but the 36w EcoWhite does seem to perform very well in comparison.

There is also a video on YouTube showing the 24w EcoWhite mounted on 4m columns in Erasmuspark in Amsterdam. In the video the light output looks very green, but a picture taken for the Innolumis website shows them looking more white:

Here is a 36w EcoWhite example:

Sotonsteve and I have been able to see this installation at night to see how well it performed. Approaching the lanterns there is a distinct green (but not unpleasant) tinge to the light.

Unfortunately the camera did not fully capture the true colour and the pictures appear more white than they really were.  the lanterns the light was bright enough to clearly read the small font on my driving license photocard. Fully colour rendering was maintained although with a slight green tinge.



There are 4 red and 4 green LED modules although the green overpowered the red ones.



Another view, again the light is more green in practice.

Nice Post................

Residential Led Lighting| Commercial Led Lighting

There were some Lumises lighting the subway to Newbury Park tube station in London near me which replaced Phosco P567s but for some reason, after only 2 years of service, they were replaced with DW Windsor Monaros a few weeks ago:

Streetview of the Lumises

My pic of the Monaros

We installed some of these on a footpath a few years ago with limited success. Although the light output is very good, they're hideously heavy, expensive, and at 63w give negligible energy savings over a 70w SON.

I have fixed the broken links in my previous post from 2010. Those images are of the Plymouth installation mentioned by Versalift09.

The Lumis lantern has been slightly redesigned since then. There is also now a white LED version. Pictures of the new version in use in the Netherlands and some night shots start here.

Yeah, I suppose 7W won't make a huge difference! But then it'll be interesting to see what wattages the Monaros run at and what the energy savings are compared to the Lumises! I guess if TfL aren't impressed with those either, they'll probably replace them within a couple of years as well!