Difference Between Similar Terms and Objects

Difference Between ANSI Lumens and Lumens

ANSI Lumens vs Lumens

If you are constantly using a projector at your home or at your office for your presentations or other entertainment needs, you may have overlooked one important detail of your device – the lumen. Upon inspection of your device, you’ll see that all projectors are marked with a certain lumen rating or value while most modern projectors today are already marked with an ANSI lumen rating. So how do these two differ?

“Lumen” is actually the more generic term that refers to the measurement of the device’s luminous flux. This gives the user an idea of how much light can be output by the projector. So in much simpler terms, “lumen” is just measuring the entire light that is emitted by the source.

The lumen (bearing a symbol “lm”) quantifies the aggregate amount of light that can be seen as emanated by a particular light source (i.e. the projector). Mathematically, one lumen is equal to one candela multiplied by steradian (1 lm = 1 cd·sr). This is describing lumen with respect to candela. But when describing it in relation to lux, it is written as 1 lm = 1 lx·m2, which is actually equating one lumen to the product of lux and a specific area being measured.

On the other hand, ANSI lumens have been specifically described and structured by the American National Standards Institute thereby giving the name “ANSI.” Historically, the ANSI standardization of lumens was devised in 1992 which specifically measures the video lumen output generated by projectors.

The ANSI lumen is already a result of several variables like the contrast and brightness; measuring the white fields at certain multiple spots located on the screen, and also averaging the said measurements which are then multiplied by the measurement of the total screen area. The resulting ANSI lumen measure is definitely more accurate than plain lumen. That’s why it is the barometer used by buyers who shop for new projectors.

However, basing the choice of a projector solely on its highest possible lumen rating may be misleading at some point. This is because an ANSI lumen does not clearly include other variables like screen material, the viewer’s eye tiredness, amount of ambient light present, and other factors which may alter the brightness and clarity of the projection image.


1.“Lumen” is the basic measure of luminous flux (the observed power or strength of light).
2.ANSI lumen is measuring lumen as stipulated by the ANSI standardization. Thus, it is more specific and accurate for determining the brightness of the projector.
3.ANSI lumens have been observed as one of the values or units to look at in most of today’s modern projectors especially if you are buying one.

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    • Agreed. I was hoping to find something like 1000lm=982ANSI lm ……. or something….

    • I didn’t find any equation converting lumens to ansi lumens but while I was searching for a new projectors specifically for DLP projector I found for example a brand name AUN mini projector model D7 rated @ 2000 Lumens & 200 Ansi lumens.
      Another AUN mini projector model D8i rated @ 3200 lumens & 350 Ansi lumens
      Another mini projector brand thundeal t18 dlp with 180 ansi lumens and 2000 lumens.
      All above dlp projector are low end mini projector that are only good at night with lights off according to people who owned the device.

      I have found that all DLP projector that is high end with above 700 ansi lumens they don’t mention lumens only ansi lumens.
      Example like brand xgimi h1 rated 900 ansi lumens and not stating how many lumens.
      Also newer model xgimi h2 with 1350 ansi lumens and no mention how many lumens.
      These two model I found in youtube comparison of how they perform in daylights or lights on.
      I found that 900 ansi lumens is acceptable at day light while 1350 ansi lumens is great but still not like your LCD tv brightness.
      Another high end chinese brand on aliexpress jmgo model J6s rated @1100 ansi lumens and no mention of how many lumens !!!
      I hope this helped a little.

  2. A description but not a relative comparison. Waste of time for me.

  3. Can i know 1000 ansi lumens is equal to how many lumens ?

  4. ANSI standardized a method of measuring lumens. It can not say “ANSI lumens,” unless the ANSI method was used. It may even have to certified by ANSI, I’m not sure. If it doesn’t say ANSI, the methodology is unknown, so there is no way to “convert.”


  6. I think Terence (Dec 2018) got it right. I’ve read other places that manufacturers and sellers can list any number of “lumens” they want to. If there is no standard form of measurement (i.e., ANSI), then the number does not mean a thing.
    Here’s another twist — Epson tells me they no longer use “ANSI Lumens” since it’s an old standard. They use something called IDMS for color output and ISO for white output of their projectors. Now I’ve got to figure out what those mean! Anybody out there able to help?

  7. In general, 1,000 LED lumens converts to 417 ANSI lumens (LED lumen value ÷ 2.4 = ANSI lumens; the conversion rate is based on the manufacture’s publicly disclosed numbers).

    1,000 light source lumens converts to 60 ANSI lumens (Light source lumen value x 0.04 to 0.06; the exact conversion rate depends on the efficiency of the projector’s LCD panel for each manufacture).

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