The problem with LED lighting's "flashyness" is not the LED's themselves, but the drivers they are using. Seeing as DMX is only values from 0-255(8bit), that means you can have 255 unique steps of brightness with the LED's, which in darkness can be quite noticeable. However, to counteract this, the fixture itself would have to use a higher resolution LED driver, and sort of "fade" between values internally. For example, if it had a 10bit driver, you'd have 1023 brightness values, which the fixture could then internally "map" from 0-255. So for example, sending it a DMX value "1" would have it increment (roughly) 4 brightness levels.