The chinese units can be very bright, intensity isn't the problem. The problems are all with the lack of smooth dimming, and potential for poor build quality.If your swapping Altman Fresnels for $150 LEDs, just be prepared for a dramatically lower level of illumination. We use between $1300 and 1400 as a unit cost for LED units in general when preparing preliminary estimates for a typical high school theatre. I know how tight money is - especially non-capital projects - but it is sad that this far below acceptable choice has to be faced.
There's nothing wrong with the Chinese stuff *EXCEPT* it's made in China. Notorious for stolen technology, questionable materials, workmanship, and general quality. Unless you are buying from a local company that WILL absolutely back and service the product, I'd avoid it like the plague...There is nothing wrong with the Chinese stuff. I is very bright (much brighter than a fresnel with gel on it) and has decent color mixing. Where they tend to come up short is availability of spare parts and matching from fixture to fixture. I also would not recommend using them in a temporary setting since the build quality can be very questionable.