i-Phos Light Spectrometer

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i-Phos Spectrometer

Click to watch the video showing what the i-Phos can do:

From only £67, the i-Phos Light, IR and UV spectrometer is an affordable entry into professional-standard light, IR & UV spectroscopy.

It's easy to use. Just install the free Windows PC software, plug in to USB and right then - you're analysing the light entering the instrument - accurate to within about 5nm, in dynamic colour graphics. It's a light wavelength meter.

The i-Phos can see wavelengths from approximately 420 - 980nm and their relative (though not their absolute) intensities. You can analyse sunlight, moonlight, indoor and outdoor light sources, grow lights (LEDs, CFLs, HIDs, etc.) - light spectra from anything.

You can configure the instrument to perform absorption spectroscopy, for analysing oils etc.

The software provides sophisticated features to make using your i-Phos a fascinating pleasure, yet it's really easy to just plug in and get started.

Full software documentation is provided.

Who is i-Phos For?

Horticulturalists, professional or otherwise, can use the i-Phos to design and then maintain the perfect lighting setup for their needs - in terms of the emitters and the transparency of their enclosure materials.

Educators in schools, colleges and universities will find teaching light science with the i-Phos easy and fun.

Parents will find the i-Phos a real asset for their inquisitive children to explore light science.

Scientists, at work and at home, will find the i-Phos, with its 1nm accuracy, just as capable, in many ways, as scientific instruments costing 100 times as much.

Whoever you are, diverse fields of application could include astronomy, Raman spectroscopy, oils analysis, flame analysis, checking LED and laser calibrations, and much more.

Here's a customer's blog about using his i-Phos.

i-Phos Light Spectrometer

Construction is as follows:

  • The cylindrical body is approximately 80mm (3 1/4 inches) in diameter and 330mm (13 inches) long. It is made from high density cardboard, covered in glossy plastic sheeting. The inside is spray painted matt black to minimize glare.
  • The back plate houses a CMOS camera sensor and a diffraction grating, held in precise registration by a 3D-printed mounting frame.
  • The 3D-printed front plate allows the fitting of exchangeable slit plates, so you can control the light levels entering the instrument.
  • Between the front and end plates is a 3D-printed diaphragm plate which improves instrument performance.
  • The i-Phos comes with one 1mm slit plate. Other widths are also available.
  • The i-Phos comes with a standard USB 2.0 USB connection for use in Windows PCs and laptops. USB 3 is also fine.
  • A 3D-printed industry-standard mounting clip is available, allowing you to mount your i-Phos on standard tripods etc. Do reduce cost it's an optional purchase.
  • The software is FREE and OPEN SOURCE. You can download the source and make whatever changes you like.

Production continues
from my home office
as normal during the pandemic.

Purchasing Your i-Phos

i-Phos spectrometer & 1mm slit plate


This tem is mandatory
the tripod shown is not included

Packing & Posting (Shipping)

This item is mandatory. Choose your region.

United Kingdom £10
Rest of World £22

UK orders are sent Signed For.
International orders are sent tracked &/or signed for,
depending on service availability ytour country.

Import duties might be payable in your country which you would be liable to pay.

Tripod mounting bracket


Allows you to mount your i-Phos on a tripod or other support using a standard mount attachment. 3D printed, with a steel threaded attachment point.

Check box to include a mount


By default your i-Phos will come with a one-piece fixed aperture 1mm slit frame. It's a simple cost-effective solution for many applications, and a great choice for beginners and tinkerers.


You do not need to select this item.
Unless you select the slit frame below, your i-Phos will come with this frame.

If you are working with very bright and/or very dim light sources, you will want the ability to change the aperture on your i-Phos. That's what this slit frame does. It's a three-piece frame which allows the insertion of interchangeable slit plates - from 0.5mm to 5mm. It comes automatically with the 1mm slit plate, and you can purchase others as you like.

Slit frame for interchangeable slit plates


Check box to include the interchangeable slit frame


Additional Slit Plates


Narrower slit plates give slightly higher resolution but admit less light, so they are good for strong light sources. If you need more sensitivity for weaker sources, a wider slit plate allows more light into the instrument at the expense of a little spectral resolution.

Check any additional slit plates you need below:

Blank slit plate
(for storing spectrometer)
0.5 mm slit plate
2 mm slit plate
3 mm slit plate
4 mm slit plate
5 mm slit plate

Sale Documentation

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If you need any additional documentation there is an administration charge.

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Paper (posted to you) £20

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What my Customers Say

This thing is great. Thanks for putting it on [sale] at a very affordable price
Mike, USA

I have tested the spectrometer and it works as easy as I have hoped. Thank you.
Nico, Netherlands

Hi Chris a big thankYOU ( or as we say in some parts of Oirland ‘Go Maith Agat ’) for a brilliant product, great delivery, customer service, and empowering me with a superb instrument to see the world with so many colourful and ‘non visible to the naked eye spectrum’ possibilities too. Enthused and thankful.

Cheers ( I admire Great British designers like you),
Sean, Co Meath, Ireland

[I] just wanted to let you know that I received the Spec[trometer] all in good order and I have played around with it a bit and I think it is excellent - really happy with it.

Im using it for various things including looking at LED grow lights , confirming the wavelength of some gadgets that I got from China but was never sure of how accurate they were, and things like that - I realised it can be a very useful tool to have around and was going to build it myself but you had worked out all the details so made more sense to get it from you.

Anyway, just wanted to say thanks and will let you know if I think of any upgrades with it in the future.
best wishes
Antoine, Ashord, UK

Hi Chris.
I have the spectrometer working here now. Really good, I'm very pleased.
Very many thanks,
Steve, UK

just fired up the spectrometer and software, 10 mins and its running. Just taken the spectra of a UV torch, fluorescent and filament lamp. Truly an amazing piece of kit. I thought of getting an optical spectrometer like at uni but this was the most cost-effective. Solar spectrometry is next on the weekend. I found you on Amazon, it's great to have this artisan industry in the world and accessible to all.
Misha, UK

The spectrometer is amazing, it actually works much better than our old (and expensive) Vernier spectrometer! I already got a very good spectrum of the sun, after just a quick calibration. The spectrometer will be used in a workshop for students about atomic physics that we offer [here]. So far I'm not sure what we will look at exactly, but I already see lots of possibilities!

Thanks again! Best regards
Charlotte, Switzerland

Hi Chris,
Just wanted to let you know that I got it now and already tested it. Cool device! I like it very much.
Andreas, Switzerland

Oh my God!
I'm loving this. ... it all works automatically without any manual downloads on my Windows 10 PC. I will be studying for days the light from various devices.

THANK YOU CHRIS! You have saved me potentially thousands. And hopefully I will be able to better understand the nature of my eyes sensitivity.

FYI, I will send you some snapshots of the white screen from various monitors. When I get a laptop I will be able to analyse the light from more monitors.

U.R, Australia

Hello Chris
The i-Phos is arrived in Switzerland and works very well.
Horst, Switzerland

Hi Chris, Just just to let you know I recieved the Spectrometer today and it works like a charm. Thanks again!
Nico, Switzerland

Thank-you for your great job
Daniel, Belgium

Hi Chris,
now I was successfull and the spectrsocope works well!
Compliment for this development - great!
Many Thanks for your advice and patience
Best wishes

Wolfgang, Germany

Hi Chris,
It's arrived! I'm using a small tripod (that I forgot I had) to keep it steady on my desk. It looks awesome. It's even better than I expected. [...]

I managed to have a quick play at lunch time. Calibration wasn't as complicated as I feared (even though one of my cats moved the tripod while I was trying to calibrate!)!

I have to say it's a fantastic product, so much better than I expected.

I'm going to have a lot of fun with it.

Paul, UK

Hello Chris ! nice to meet you.

I got your nice spectrometer some days ago. I just had the time for a quick test, It is great and it perfectly fits to my hopes.

Domi, Belgium

Hi Chris

Thank you for all the detailed instructions. I just found some time yesterday to properly calibrate the i-Phos and test it.
It works like a charm. :)

Alexander, Switzerland

Hi Chris,

I am very pleased with the i-Phos I purchased before Christmas and would now like to fit a tripod mounting bracket.
Please advise how I can purchase the bracket as a separate accessory and the extra cost for postage and packing.

Eamon, UK

Hi Chris,

I received the spectrometer yesterday and it works like a charm. Thanks!

I intend to primarily use it to test and verify various red and near-infrared light sources for photobiostimulation.

Best Regards from Denmark


Thank you very much for taking the time to update me and also for the excellent manner in which all of your communication and detailed information regarding this product. Your professionalism is a credit to yourself and is greatly appreciated.


Dale, Australia

Hi Chris,

... I started to use it with my students, and it's one of my favourite tool ! Thanks alot for your explanations, and your time.

JF, France


i-Phos Questions & Answers

Can you extend the range of wavelengths it can see?

No. The sensor is based on a webcam designed to see visible light. With the IR filter removed it can see a little beyond that into both UV and IR but not far and it can't be extended further.

Can it measure blue light?

Hi, I am a dark skies educator, and I am looking for a reasonably portable spectrograph or spectrometer that I can use to measure the blue light being emitted from LED street lights of 3000K+. Would this model be able to do that, or am I going to have to look for some a tad bit more expensive? Thanks

- Hi ***,

It's difficult to say because it depends how bright and how far away the street light is from the instrument.
I have a video showing me collecting the sodium spectrum of a street light opposite my office with my i-Phos on my channel here: .https://youtu.be/Tz43jRf8FjY?t=352

- but I think I used the interchangeable slit plate model with a 5mm slit plate. To be on the safe side, I would recomment that version.
The Pro Bundle includes all 6 slit plates from 0.5 to 5mm, and you can remove all slit plates for an even wider aperture. If you're on a budget, then you could also modify the front end cap yourself - slit plates are low-tech devices - but you'd need to ensure that the plate is aligned rotationally with the camera or your spectral lines will be tilted.

Another option for you is to buy the cheaper version and try it - and if it is not suitable for you, contact me again and I can sell you the interchageable slit frame and you can replace the old one.

I would also be interested in working with you to see if you can get the i-Phos to produce good spectra from sky objects like the moon or a bright star.

I'm sorry my answer isn't a solid YES or NO, but I hope the advice and options offered are helpful for you.

Best Wishes

Can it analyse inks?

Hello, I want to know if is possible use it for get the ink spectrum on documents?
And if is possible get better price if a order 5 pieces

Thanks for your comments

***, I have not tried to get spectra from ink but this would be done using the absorption method. Shine a white light on the ink and measure the reflected light looking for absorption lines which would chracterise the composition of the ink. So, in theory, it is possible, but in practice I have not tried it.

Sorry, there is no bulk purchase discount.

Will this measure PAR & Intensities?

It's complicated.

PAR is an achronym for "Photosynthetically Active Region" - that range of wavelengths of light which promote photosynthesis - the process plants use to live and grow.

A PAR Meter measures light intensity - or "flux density" - the amount of light landing on a certain area per second. PAR meters will have filters but they don't usually measure the specific wavelengths of light - just the intensity. So, for example, your PAR meter won't "know" if your light source completely fails to deliver some wavelengths which are important in fruiting.

This instrument fills that gap - it measures the wavelengths and their relative intensities, so you can see which wavelengths (colours) are being delivered, and which are not. That knowledge allows you to take action (changing or adding light sources) for optimal performance.

Sorry to trouble you. Do you actually mean UV-VISIBL and not UV-IR Spectrometre? The spectrum chart indicate the former. Thanks.

You're not troubling me -thank you for your question. The sensor can see wavelengths from about 380 to 1000 [now 930] nano meters, which covers near infraread, visible and nea ultra violet wavelengths.

Does it run with Windows 7?

is it compatible with windows 7 ?
can I study filter transmission, like multigrade silver print filters ?
Best regards


Yes, the software should work with Windows 7 and back to Vista! Yes, you can study filter transmission. bear in mind that the software shows a real-time graph of wavelength against relative intensity, but not of absolute intensity. So you cannot measure flux density, for example, but you can easily see visually what your filter is doing to your light source.

Best Wishes

Can it do gemology?

I would be grateful, for any information about utilizing this spectrometre in the field of gemology, especially the Raman spectroscopy. Thanks.

The short answer is "I don't know". Ceretainly, the i-Phos will analyse the spectra of light sources, but Raman spectroscopy relies on analysing the 1% or light from Raman scattering, so the intensity might be very low. If you can arrange for all of the light to enter the spectroscope - maybe by removing the front aperture and using a long integration time, you might get a good spectrum, but it's not something I've tried to do.

is the software also part of the auction?
If yes, which system requirement does the computer need?
With friendly greetings

Hello. Yes, the software is included. I sent a download link when shipping. This software runs on a Windows PC.


How do I set exposure correctly?

Hi Chris,

I had a lot of fun with it yesterday, and I sent my friend on discord many graphs!

I noticed that the exposure setting can make a significant change to the graph. Is there a good rule of thumb for ensuring it's set to the right value for the thing being tested?


Hi Paul, the i-Phos is a compromise - for less than 1% of the cost of a lab insrtument you get a lot of functionality but you don't get everything.

So the i-Phos displays an approximate relative intensity graph for the wavelengths of the source. This is explained in the sales literature.

The i-Phos is perfect for checking the central output wavelength of power LEDs lasers etc. but it's not ideal for relative intensity measurements.

Even so it's still very useful. See the comparisons between i-Phos charts and Ocean Optics lab instruments on my channel - they are almost identical.

As you point out - in some cases, the relative heights (intensities) of wavelengths change with exposure - and they can't all be true!
How you accomodate this depends on the objective of your analysis but in general, avoid saturating the webcam sensor by dialling down the exposure to keep peaks away from the top of the graph.

If you are only interested in part of the spectrum then adjust exposure so that THAT PART of the spectrum has the right exposure - not bumbling on the X axis, but not smashing the top either.

Fundamentally the webcam sensor should be kept out of the noise floor and saturation regions.

It will take a little time to get to know your instrument and how to get the best from it.

Ultimately, rest assured that if you're not happy - you will get your money back!

Best Wishes

If you have questions about the spectrometer,
please use the video comments below the video.

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