While flicker was formerly regarded as a problem area, particularly during the early attempts at emissive infrared projection, most of the current generation projectors are either flickerless or can be operated in a mode which is close to flickerless.
Source: wiktionary
These compact units produce heat-free, flickerless, silent light and some units can be dimmed from 100 percent to full off with no color shift (unlike many other types of light).
Source: wiktionary
The overhead fluorescents burned flickerless, intense.
Source: wiktionary