02/02/2018 - BLOG - "Watts a Lumen?"


Lighting specifications seem to be a cause of considerable confusion. Old style filament bulbs were routinely specified by the number of Watts of electrical power that they consumed, and everyone could appreciate that a 100W bulb was brighter than a 60W bulb. However, this description can’t really cope with the different bulb technologies that have become available; for example, that 60W bulb is significantly outshone by a 20W fluorescent tube. The reason for this is down to the differing spectral content of the light from different sources types and the fact that the human eye has different sensitivities to different colours; 1W of green light appears to be significantly brighter than 1W of red or blue. Filament bulbs actually emit most of their radiation in the infrared (which we can’t see) whereas domestic strip lights and LEDs emit only in the visible, hence we need less power from these newer types of source to get the same apparent amount of light as the old bulbs.

The brightness of a source (bulb, LED, whatever) is more correctly specified in units of lumens, which describes the apparent brightness, as perceived by the human eye, and this quantity is now routinely quoted on most domestic lighting packaging. A 1000 lumen bulb will provide the same amount of light as a 1000 lumen LED or a 1000 lumen fluorescent tube.

White-light sources are also often now described by terms such as warm, cool or blue, reflecting the mood that they create. This differing sensation is again due to the different spectral content; cool light has more blue content compared to warm light. This “quality” of the emission is expressed in a quantity called the colour temperature; the higher the colour temperature then the cooler (i.e. bluer) the light (typically, colour temperatures range from around 2200K up to 6200K). Whilst those 1000 lumen sources do indeed provide the same amount of light, subjectively they may appear quite different.

30/11/2017 - Welcome, Peter Rees!

We’re excited to welcome new recruit Dr Peter Rees to LumOptica. Peter graduated from Cardiff University with a First Class Honours degree in Physics where he stayed on to obtain his PhD in the field of semiconductor lasers. During this time he developed novel techniques for the precise measurement of the optical efficiency of high power semiconductor lasers. He has extensive experience in the characterisation of light emitting devices through spectroscopic analysis of emission and photovoltage, farfield and nearfield imaging and intensity measurements. He is also a capable user of optical mode solving software (Fimmwave and COMSOL) and an able programmer (primarily utilising Python and C#).

Great to have you on the team, Peter!

Peter Rees

26/10/2017 - Cyber Essentials Certified

We are pleased to have been certified as Cyber Essentials compliant. This is a government-backed, industry supported scheme to help organisations protect themselves against common cyber attacks.

Cyber Essentials logo

22/10/2017 - ISO Class 7 Clean Room Commissioned

We are pleased to announce a new addition to our R&D facility: an ISO Class 7 clean-room for build, test and development of optical components and systems. Additional peace of mind for our customers who have come to expect quality and best-practice.

Clean room

For more information on how we can help you to turn your ideas into products, do not hesitate to contact us.

23/06/2017 - LumOptica now offers COMSOL multi-physics modelling

To complement our expertise in optical modelling and simulation, we are pleased to announce the addition of COMSOL to our capability set. This is an extremely powerful software package for undertaking coupled, bi-directional multi-physics modelling based on finite element analysis. So, whether you’re interested in the propagation of lasers causing non-optical effects or vice versa (or both!), we can help.

Temperature of fibre face and body

20/01/2017 - Atmospheric Lens Concepts

BAE Systems PLC recently announced concept work it was undertaking which incorporated feasibility studies that LumOptica have undertaken around laser-atmosphere interactions to induce perturbations on EM waves. This is a fascinating subject area and one in which we were able to bring value-added expertise in high power lasers, optical design and technology intelligence. The full article can be seen here

28/09/2016 - Photonex 2016

Photonex 2016

We are excited to be exhibiting once again at Photonex, 12th & 13th October, Ricoh Arena, Coventry, UK. If you’re able, do come and see us at stand IL05.

Again, we will be giving a talk at the Photonex Innovation Live! meeting on Thursday 13th at 11:40…

Speckle – If you can’t use it can you lose it?

Speckle! Most of us in our industry would claim to be familiar with the phenomenon, at least to the extent that
we could qualitatively explain how it arises, and we’d also probably be aware that it can be usefully exploited
(as in a speckle pattern interferometer) but that it can also be a nuisance (e.g. in laser projection systems).
However, by its nature the treatment of speckle is mathematically complex and most of us would probably
be happy to confess to not understanding it in any detail. This talk will delve into the subject of speckle a little more deeply, avoiding the mathematics (mostly) but hopefully providing an illuminating insight into its properties. The talk will conclude with a look at some of the approaches that have been developed in order to reduce speckle in laser projection systems.

10/06/2016 - LumOptica to present at the 15th EOIR Conference, Shrivenham

Defence Academy
We are pleased to be presenting at the Electro-Optics and Infrared Conference, at the Defence Academy/Cranfield University, Shrivenham on 20th June 2016. We will present our latest developments in ultrabroadband multi-spectral beam combining.

Hope to see you there!

15/04/2016 - Happy Birthday to us!!

We are 1 today!

It felt appropriate that we were founded during the UN’s “International Year of Light” last year, albeit with slight apprehension! It’s been an exciting and profitable year and we’d like to take the opportunity to extend our deep gratitude to our customers, associates and well-wishers.

03/11/2015 - White Paper - Easy as ABC (...and D)

In modern times, the position of beam waists of Gaussian laser beams are readily found in optical design software packages but this gives no insight into why or how the beam waist finds itself in that position. This tutorial shows that a pair of equations can determine the position and size of a new beam waist if the position and size of an initial beam waist is known and there is an “ABCD” matrix representation of the optics following the initial beam waist….open here.