Lumu iPhone smartphone lightmeter with leather pouch and branded cards on a red and white checkered tablecloth

Lumu Light Meter Review

Smartphone Light Meter Review

Every digital camera has one, even every basic smartphone has one built-in. We are talking about a light meter, the part that tells the camera which aperture, shutter speed, and sensitivity to set.

However, this is a bit different with analog cameras; not every camera where you can set the exposure has a light meter. Admittedly, you don't need one for a Holga, but for a Lubitel or another TLR or SLR, a light meter is a good thing. If you don't want to or can't estimate the exposure yourself, you need an external light meter.

Now you can get a light meter used, as they were needed in the past. Unfortunately, you have to deal with problems like batteries or accuracy, there are exceptions, of course, but it's not really great.

Another option would be to buy a modern external light meter. However, these start in the lower three-digit range, and you don't even need most of the functions.

One way or another, the creators of Lumu, not to be confused with Lumi or Lomo, must have thought something similar and started a project on Kickstarter to finance a light meter for smartphones. The project was successful, and you can now buy the Lumu.

Lumu lightmeter attached to an iPhone 5 on a red and white checkered tablecloth, showing exposure readings of 5.6 and 1/160
Lumu on the iPhone 5
iPhone showing the Lumu Lightmeter app displaying f/1.4, ISO 400, and 1/60 exposure settings over a scenic mountain road
The app on the iPhone
Screenshots of the Lumu Lightmeter app notebook on smartphone, logging a Nikon F90 film session with exposure notes and a bamboo thumbnail
Notebook function in the app
Two smartphone screens showing the Lumu Lightmeter app pinhole mode with circular exposure timers on a blue gradient background
The pinhole app
Lumu lightmeter with white spherical sensor hanging on a wooden fence, shown with tan leather accessory pouch on red checkered cloth
The Lumu accessories

The scope of delivery includes, besides the light meter, a small leather case, a chain, a short instruction, and two stickers. The whole thing comes in a chic metal tin.

The leather case can be attached to a camera strap with two loops on the back if desired. And for the fashion-conscious, the Lumu light meter can also be worn around the neck.
You can order the Lumu light meter, as far as I know, only through Lu.mu. You can choose between a black and a silver version, both costing 99 euros.

Shipping costs are included. Shipping is done with DHL Express, so the shipping time is correspondingly short, from Slovenia, where the creators are also based.

Conclusion

My conclusion? I'm thrilled! The app is great, the device itself is well-made, takes up practically no space, and does what it's supposed to do. What more could you want?

Do you have any negative or positive thoughts? Feel free to comment.

However, I do have one real drawback: the Lumu cannot measure flashes. So I have to keep using my rickety light meter. Damn!

Note: For all photos in this article, apart from the screenshots, the exposure was measured with the Lumu.