Choosing the best LCD projector lamp for you
The objective of this overview to give an independent explanation of the myriad of replacement
Projector lamp options that are currently available, however, given that the author is a shareholder
Of Diamond Lamps, it may be unintentionally biased. If this is the case, our apologies, but we hope it
is educational none the less and helped you make the selection that is right for you.
The components of a lamp
We will refer to the components of a lamp throughout this document, so it is important to define
what we mean: –
Original Equipment Manufacturer (OEM) lamps
If you have ever bought a lamp for a projector, chances are that you purchased an OEM lamp as
these dominate the market. Sony, Epson and Panasonic are OEM examples, they make the projector
and design the lamp that goes into it, they then supply the replacement part.
Performance – 100%.
If you’re buying an OEM lamp, expect it to perform exactly the same as the lamp originally in
the projector, in fact it will probably look better as your old lamp may have started to dim
Projector warranty – unaffected.
As it’s the manufacturer recommended spare part the warranty on the projector is fully
supported, though in many cases that warranty has expired by the time a lamp is needed.
Price – invariably the most expensive option.
Other comments – there are approximately 170 current and obsolete OEM brands, some
design and build their own projectors while others buy and re-badge or fully outsource their
work. Because of these convoluted supply channels, replacement lamp boxes tend to not
have any brand markings on them, if you are unfamiliar with your supplier, this makes it
tough to verify if you’ve been supplied with an original lamp or a lower quality copy.
Genuine alternative lamps, E.g. Diamond Lamps
Defining what is ‘genuine’ is not easy, but here’s our interpretation:
Although there are 170 brands of projector, practically all of them have to source their bulbs from a
lighting manufacturer. Sony for example, develops a new projector, going to a lighting manufacturer
such as Philips to specify and design the bulb for the unit. Given that it takes between 5kV and 20kV
to ignite the lamp the electronics are pretty important and the tailored bulb driver is often
purchased from the same company.
There are only seven bulb manufacturers who supply the OEM’s, Philips (the pioneer of the bulb
technology and market leader), Osram, Ushio, Iwasaki (Eye), Matsushita (Panasonic), Phoenix and
more recently Epson who used to fully outsource but are increasingly manufacturing their own light
A genuine alternative lamp uses the same specification bulb Philips supplied to Sony in the above
example. It will also be supplied directly from Philips and the brand endorsed by Philips. The bulb is
then fitted into a cage that is a duplicate of the OEM’s cage so the delivered product looks and
performs identically to the OEM product. This nit-picking description is necessary to differentiate
against the next category of Grey genuine alternative lamps.
Performance – 100%
The product is identical to the one supplied to the OEM.
Projector Warranty – questionable, the situation has never been challenged as a projector
has never failed using a Diamond Lamp. In theory, given the identical bulb, the warranty
should hold, although it would be understandable if an OEM was reticent on supporting it.
Price – noticeably cheaper than OEM lamps.
Other comments – Some bulbs are interchangeable Sanyo for example supply spares using
both Philips and Osram bulbs for the same projector. Some manufacturers print their name
on the bulb; others just put markings making it more difficult to determine if you have an
original bulb. Here is a list of genuine bulb markings you may find.
Bulb Manufacturer Markings
Iwasaki (Eye) HSCR, MSCR
Matsushita UHM, HS, ‘M’
Osram P-VIP, VIP
Ushio NSH, UMPRD
UHE, but also used on bulbs
made for them by the above
Grey genuine alternative lamps
Quite a mouthful and not exactly a catchy title, but please read on.
The bulb manufacturers have a very short list of companies they will supply with their bulbs to make
genuine alternative lamps. In the case of Philips that’s currently 4 as they need to know that there
are exacting standards of production and that the finished product will be distributed both honestly
and ethically. Grey genuine lamps are not supplied directly from the manufacturers; they tend to
come from OEM’s selling off excess stock into markets near their Asian factories, the product
subsequently leaving the territory.
The challenge here is that a bulb manufactured for one OEM’s lamp often gets ‘shoehorned’ into
another OEM’s lamp because the correct bulb isn’t available but there is a grey market item with
similar ratings. This isn’t always the case but the risk is real and it’s a high voltage one! The simple
check is to see if the genuine brand you are buying has been endorsed by the bulb manufacturers; if
endorsed then you are pretty much guaranteed that the lamp is right for your projector.
Performance – possibly 100%, but only if the right bulb is used.
Projector warranty – questionable, if the wrong bulb is used it’s more likely to damage the
projector and less likely to be covered
Price – similar to genuine alternatives for the most part, though cheaper models do crop up
where a grey bulb has been sourced at a very low price
Copy lamps or Branded compatible lamps
Copy lamps do not use bulbs originally used by the OEM and have one distinctly attractive feature in
usually being the cheapest option. Knowing it’s an imitation, it is generally understood that there will
be compromises in quality and it’s a matter of deciding what’s acceptable. Unfortunately, this can
only be done through trial and error and it’s a pretty expensive testing process.
Every user has different expectations and it is possible for the copy lamp to be perfectly acceptable.
However others will prove to be a false economy compromised by low quality and life; it’s basically
down to each individual’s budget and appetite for risk.
Performance – typically poorer in terms of brightness, colour uniformity and life.
This is mostly down to less exacting standards in manufacturing and build.
Projector warranty – less likely to be honoured by the OEM
Price – often the cheapest lamp option.
There may be different copies available for the same projector model at different prices, as
with most things in life; you tend to get what you pay for.
Other comments – Although manufacturing and selling copy lamps are legal, there are a
number of copy lamps that are alleged to breach the intellectual property of the original
bulb manufacturer. There has already been successful litigation in the USA for distribution of
IP infringing product (with damages at $28 per unit sold) and current litigation is underway
with others in a number of continents.
Further information on the quality of copy lamps there is an independent study (commissioned by
Philips) performed by KEMA. The results can be seen at this web address.
www.diamondlamps.net/news.asp. Click on the link at the bottom of the page to go to the full report.
Further information on Intellectual Property rulings can be seen at this web address
Re-lamping / refurbished lamps – changing the bulb
All the above options have a new bulb and a new cage. In re-lamping or refurbishing the lamp the
old cage is retained and the bulb replaced.
There are three types of bulbs that may be supplied.
1. An identical genuine bulb
2. A grey genuine bulb
3. A copy bulb
The performance risks are identical to the above lamp categories. However, there is also some
debate as to the viability of using a cage multiple times, arguing that connectors may have degraded
and / or the plastic being heat stressed. There may be merit in the arguments, although with no
moving parts it is hard to see how there could be issues. In our experience there are no issues, but
perhaps this is down to the quality of processes used in our re-lamping.
Quality is also determined by who is doing the re-lamping and even some OEM’s offer the service
themselves, however, these are pretty much exclusively provided for large venue Xenon based
lamps that cost many thousands of dollars.
Performance – variable, depending on the bulb used
Projector warranty – As above lamp options
Price – usually a little cheaper than the all new alternatives
Other comments – Usually you will need to send your old lamp off to be re-lamped leaving
you without a working projector unless you invest in a spare.
Re-lamping / refurbished lamps – changing the burner
Now we’re getting more technical. The bulb constitutes a mirrored
reflector, some bits of wire and a burner the really clever bit in the
middle where all the action takes place. Some refurbishment options
will swap the burner retaining some or all the components around it,
most particularly the reflector.
Our understanding is that no original bulb manufacturer sells their burners to third parties, so any
refurbishment service will be using a copy burner. This can become highly misleading when the
reflector is retained that still displays the original markings implying the specification and origin of
the burner. In addition to the question of burner performance using copy product, there can also be
concerns about the burner alignment. A poorly aligned burner means the light is not reflected
accurately, seriously restricting the light output of the lamp and disrupting the colour uniformity
across the image. Unfortunately, it is not possible to identify a copy burner with the naked eye.
Performance – at the level of copy lamps as a maximum, but potentially lower
Projector warranty – no chance, although given the reflector retains the same markings,
some OEM’s wouldn’t notice what’s transpired.
Price – usually the lowest price point, although there are invariably drawn out logistics
involved in the return of product as it needs specialist assembly.
Unfortunately these do exist and there is a growing trade in them that many resellers are unwittingly
passing to users.
Asian factories are installing copy burners in copy reflectors that then have counterfeit markings. As
grey genuine bulbs bounce from agent to agent across Asia the copy bulbs get mixed in and until
sold to the west as ‘genuine’. Because it is impossible to neither distinguish a copy burner with the
naked eye nor test it without a projector, resellers in the western world who don’t buy from genuine
sources are unaware that counterfeit goods have infiltrated their product line.
The easiest way to safeguard against these is to be wary of items that are too cheap to be true and
to be circumspect about buying from by individuals on internet auction sites rather than registered
companies with a trading history and reputation.
Some brands such as Diamond Lamps are manufacturer endorsed as being from genuine supplylines, it is recommended that if you don’t buy the OEM lamp you seek out endorsed