I’m sure at
this point there are many reviews of this projector already made out there by
various YouTubers and online personalities, and they’ve covered much of the
casual use cases of the projector, so in order for me to add to the
conversation, I need to dive much deeper into analysing the actual picture
quality with professional-grade tools, something that seems to be lacking even
at the time of this writing.
This review
pertains only to the non-smart version that I have here, and it’s going to
focus more on the actual picture quality of the projector, like it’s colour
balance, lens quality, etc. Therefore, this review will not cover the basic
features or the various Android features of the smart version that you can
probably already see or read in other reviews. If you’re reading this
review, you’d probably want to know if this projector can live up to the
standards of the more high-end home theatre projectors or TVs out there, or how
accurate is the colour reproduction, so you’ll most likely wouldn’t need me to
talk about how good the in-built speakers are, because you will most likely
have your own dedicated home theatre speakers anyway. But for the record, the
in-built speakers are actually pretty decent.
Some of you
may not know this, but I actually also run a small video post-production
business, and although I am not a professional screen calibrator, accurate
colour reproduction is very important here, and therefore I do run basic
calibration on my screens and monitors on a regular basis. I’ve been using this
projector in my home for about 6 months, projecting it on a 68-inch screen,
before moving it to this office space to project a 100-inch image, so as to
provide a large screen viewing experience for my clients. I do have a professional broadcast monitor if they need a more
colour-accurate reference. We’ll get back to this monitor when it comes to
evaluating the colour reproduction.
Keystone Correction vs. Lens Shift
So let
start by looking at the features that you can use if you are unable to project the
image straight-on. You have two ways to do it, one is using the lens, known as
lens shift, as well as the digital keystone correction feature. There is one
important difference between the two: If you use keystone correction, your
display resolution will be compromised, which is to say the side of the image
that is squashed will have a lower resolution. You can see this effect when you
have straight horizontal or vertical lines in the image, and you will notice
aliasing or jagged edges on the lines if you use keystone correction. So
ideally you would want to use the lens to adjust the image as much as possible.
The problem
is that on the lens of the Auro projector, you only have vertical lens shift, and
no horizontal lens shift, which is a little disappointing. There is also no
zoom lens whatsoever, but that is to be expected for a budget projector. Although
now in my office setup I am projecting straight on using only vertical lens
shift to adjust the image, I had to use horizonal keystoning when I was using
this in my home setup, but even with that, the image still appears more horizontally
stretched than a proper 16x9 image, which is also an issue you would not want
to have on a projector in a quality home theatre. So essentially, if you use
keystoning, you have a stretched image that is of lower resolution. Not ideal
at all. At one point I’ve even DM’ed Lumos on their Facebook page if they have an aspect ratio correction
feature to rectify this stretched image issue, but they just gave me a
copy-and-paste response that is the same information as the guide that is on
their website, that doesn’t actually answer the question. I guess that means
that means you’re stuck with the stretched image. Oh well…
Another
issue that needs to be addressed is the quality of the lens itself. Unfortunately,
even when I can get the image mostly in focus, there are still areas in the middle
of the image that is blurry. This may be anecdotal, but I recall seeing school
projectors that look sharper than this. Lumos does claim that this projector is
not really meant for business or school use, but seeing this inconsistent
blurriness on the image is still a little disappointing if you value picture
quality in your movie watching. Also, when using the vertical lens shift, there
will be a part of the image, either the top or bottom, that will be a little
out of focus, so you will have to decide which area you would want to sacrifice
your sharpness.
On top of
that, after a couple of months of use, I did spot what seems to be a little bit
of moulding on the lens itself, it’s especially noticeable when you look at the
lens on the side when it’s on. Although that doesn’t seem to directly affect
the projected image quality itself, but it does put the QC of the lens in a
not-very-good light.
Colour Accuracy
Moving on to colour accuracy, I’ll be comparing the
projected image to a professional broadcast monitor. In this case it will be
the 23-inch
TVlogic LVM-232W. Although it looks small and its only in full HD, this thing
can cost up to S$2,700, because this is the kind of reference-grade monitor
that movies and TV shows are mastered on, and it’s almost exactly what the
filmmakers see when they finalise their movie. As for the calibration tool we
will be using to measure the more objective colour balance metrics, we will be
using this I1Display Pro Plus colourimeter to measure and balance the RGB gain
values of the projector.
There is a
very comprehensive guide by the YouTube channel Hardware Unboxed where they
will guide you on how to use this colourimeter to do some basic screen
calibration, and you can take a look at it here. But the idea
is that you will use a software called DisplayCAL to measure your RGB gain
values, and you adjust those values on your display device until they are as
even as possible. The only difference between the Hardware Unboxed guide and
this is that for projectors, instead of hanging the device over the screen, you
will point the lens at the projected image at a distance.
To be
absolutely clear, there are more advanced ways to calibrate screens, but using
a colourimeter is relatively easier for beginners, and will still give you a
very good baseline for colour accuracy. You are going to want to do this in as
dark of a room as possible for the most accurate results. Also, unlike what the
guide on Lumos’s website says, you should project the image on a wall that is
as pure white as possible if you want colour accuracy.
On the
broadcast monitor, you can see that even straight out of the box, the RGB
values are very close to being even, and usually doesn’t need much tweaking
when you recalibrate it every once in a while. However, with the default
values on the Lumos Auro projector, you can tell it’s very imbalanced, and even
after tweaking to balance it as much as possible, going so far as to maxing out
my reduction in green gain all the way to zero because the calibrator is
detecting way too much of green, the image still does not look anywhere close
to the broadcast monitor, and I have to tweak it manually by eye thereafter. After
much experimentation, these are the RGB values that I find delivers the most
accurate image colour to me, at least to my eyes:
Red – 35
Green – 30
Blue – 9
Do note that your results may vary, and if these values
don’t work for you, then I recommend to do a more thorough calibration, and you
can start by using the Hardware Unboxed guide that was mentioned earlier.
Another thing that I would like to briefly mention here is regarding the brightness levels. There seems to be a little bit of an uneven brightness curve. The best way I can demonstrate is this shot below from the movie Tenet, where the skin tones on John David Washington seems to be fairly visible on the broadcast monitor, but on the Lumos Auro, his skin tones suddenly seem darker, although everything else in the shot seems to be at the right levels.
It’s
a fairly minor issue, but it is noticeable.
Final Thoughts
So it’s clear by this point than many casual users and
online personalities seems very impressed with this projector, and I think a
large part of it also boils down to its pretty affordable S$299* price point,
and even just 10 years ago, a full-HD projector would have cost at least 7-10
times this price.
But back to the main question, is
this projector suitable for a home theatre enthusiast? The short answer is no. And
how about using it in a professional video post-production environment to
monitor your colour grade? That’s an even stronger no! However, that
said, it is possible to get a pretty good image out of it, it’s just that it
requires a significant amount of tweaking. But then again, the target customers
of this device would probably not go all this trouble to calibrate it, or they
might not even know how. They probably just want an affordable projector that
will let them watch their movies and shows on a big screen, and they’ll
probably get the Smart version anyway since it has more additional video and
streaming apps for it.
On a personal note, having used
this projector to showcase my editing and colour work to clients, I haven’t got
any serious complaints about the colour from them, but that’s also because I
had to manually tweak the colour myself to match the reference broadcast
monitor as much as possible. I also wished that Lumos will include a horizontal
lens shift in a future revision of the product, or even roll out a more premium
model of it, like an Auro Pro or something with both that as well as a zoom
lens.
Until they do that, there are honestly other projector models from other brands that will deliver a much better quality image than the Lumos Auros, even the mid-range ones, and they’ll probably have more lens shift and zoom functions. But also bear in mind that those will start off from at least S$800 – S$1,000 and above.
So overall, it’s
not a bad product if you’re dipping your hands into projectors for the first
time, and the low price of entry makes it a really compelling buy for casuals. However,
I think most people who are a stickler for picture quality, and this is their
first projector purchase, are going to be moderately impressed for the decent
picture quality they’re getting for the price, but the minor, but noticeable flaws
such as the uneven focus and the colour imbalance, as well as the lack of
in-lens adjustment options, are going to leave them wanting to upgrade to a higher-end
model later down the road.
*It should be noted that apparently this S$299 is at a 54% sale price according to their website, but at the time of this writing, it’s still listed as such even since the time I bought it 9 months ago, and I have never seen this price go back to its original price tag, which is a little misleading, and might even be violating the Consumer Protection (Fair Trading) Act, but I am not a lawyer, and therefore I cannot say for sure, so I will leave it to legal experts to determine if that is so. Until then, we shall assume the usual price is at S$299 for the non-smart version of the product.
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