Too funny. I took the first post at face value on the 5,000 lumens and looked right past the ad that said 5,000 lux.
Getting down to the real nitty gritty, CiBest is one of several brand names (including Elephas and GooDee) marketed by a Chinese company called Alphas Tech (alphastech.com). The specific model mentioned in this thread appears to be the CiBest M18 which is marketed as a "business model." Owner manual specs claim that it's a native 1080p LCD model that produces 80% color gamut. This fits the profile of other cheap LED projectors that utilize a single LCD panel with a white LED light source as opposed to DLP or 3LCD with R, G and B LEDs.
The most intriguing part of the spec is that its power consumption is rated at 150W, which is very high for an LED projector suggesting that it might be employing a brighter than average white LED. One user review mentioned that the M18 "runs very hot," which supports the possibility of a brighter than average light source. While LCD is more lumen efficient than DLP, single panel LCD projectors are typically below average for overall image quality.
The overall Alphas Tech projector lineup appears to be quite similar to the ones marketed by other lesser known companies. For example, Vankyo offers a similar projector lineup that includes one model marketed at 5,000 lux. Other little known brands such as Crenova, WiMiUS and Xinda also market similar "5,000 lux" models. Rating these projectors in lux instead of the projector industry standard lumens appears to be a way to inflate raw numbers without actually providing a direct comparison to lumen ratings from established global projector brands.
Like many other companies Alphas Tech appears to be quite active in social media as the web is littered with glowing "user" comments about the various Elephas, GooDee and CiBest projector models. They are also heavily hyped in the numerous purported "projector review" sites that have sprung up around the web offering nothing more than regurgitated projector company marketing verbiage with no actual hands-on test results. "Influencers" are often cultivated to help spread their marketing message on forums. For example, one of the cheap LED projector brands has the following posted on their website:
We understand how much influencers mean to us in elevating our brand and engaging customers. That's why we'd like to work with you to build a better future for every one of us together.