The phrase "adequate illumination" is correct and usable in written English.
It can be used when discussing the sufficiency of light in a particular context, such as in photography, interior design, or safety regulations.
Example: "For optimal photography results, it is essential to ensure adequate illumination in the shooting environment."
Alternatives: "sufficient lighting" or "proper lighting".
Invest in more than one -- a desk lamp, a standing lamp and a bedside lamp may provide adequate illumination.
The No. 1 task was to be sure that we would have adequate illumination when the skies darkened 90 minutes later.
To render the feeling of bright daylight flooding a room, the strong motivating light (i.e., light that suggests the direction of its source) must be supplemented with additional light from other directions for adequate illumination.
All images are recovered optically by adequate illumination.
The research was conducted in a 2 × 3.5 m room with furniture, adequate illumination, and noise control.
The goal is to reduce the energy consumption while providing adequate illumination on desks in an aesthetically pleasant environment.
Thus, although the results demonstrate that soil application of uniconazole can be used to control olive tree size in high-density orchards, it should be used carefully to ensure adequate tree illumination, so as to avoid crop loss.
Additionally, it also offers adequate transtympanic illumination of the promontory in the middle ear, which is visible due to the translucent nature of the tympanic membrane.
For the first time since the theatre moved indoors during the Renaissance, adequate and safe illumination became possible.
Energy savings from the use of daylighting in commercial buildings is best realized through the installation of reliable photoelectric lighting controls that dim electric lights when sufficient daylight is available to provide adequate background and/or task illumination.
Of particular importance, it may be true that those who are non-depressed may spend more time outside, thus receiving a more adequate supply of environmental illumination [ 17, 19, 21, 22, 45- 47].
