First of all, there is a certain misunderstanding in the question. Brightness is important, but for a space environment, the higher the brightness, the better.
For the living room, there are several lighting options: no main light, ceiling light, and chandelier.
So what is the difference between them?
In terms of atmosphere, no main light > chandelier > ceiling light
In terms of appearance, chandelier > no main light > ceiling light
In terms of function, ceiling light > no main light = chandelier
In terms of price, no main light > chandelier > ceiling light
It is impossible to generalise the luminosity. Although certain chandeliers are exceedingly brilliant, ceiling lamps surpass chandeliers in terms of brightness. Consequently, it is advisable to select ceiling lamps for installation if the inquirer is solely interested in luminosity.
Therefore, how can one determine the appropriate luminance of a ceiling lighting for a living room that exceeds 30 square meters? The subsequent section serves as an introduction from two perspectives:
1. Wattage
The wattage is mostly dictated by the dimensions and use of the residence. The wattage chosen for the living room and bedroom is distinct, despite the fact that the latter requires a gentle light. For guidance on selecting the appropriate wattage of bulbs for various locations, please see the chart below.
2. Lumen flux
When selecting lights, luminous flux and wattage are needed. According to the advice, many individuals purchase the proper wattage, yet the bulb is still dim. Luminous flux (lumens) controls lamp brightness. The room will be brighter with a higher luminous flux. Luminous flux = watts x light efficiency. variable lights have variable light efficiency. Ordinary bulbs emit 80-100lm/watt. In the last two years, popular eye protection lamps and non-main lighting have sacrificed light efficiency to defend against blue light and glare. The average is 60-70lm/watt. How much luminous flux is needed? Consider illuminance (lx). Illuminance is luminous flux per square metre. Residential lighting standards are explicit across the country. Different rooms demand different lighting, thus we may reverse the luminous flow. Luminous flux x maintenance utilisation coefficient/room area = average lighting.
For a 10-square-meter bedroom, the illumination requirement is set at 100 lx, resulting in a necessary luminous flux of 2000 lm, equating to an average of 200 lm per square metre. In contrast, for a 20-square-meter living room with an illumination requirement of 150 lx, the required luminous flux is calculated to be 6000 lm, corresponding to an average of 300 lm per square metre.
The specified luminous flux may be supplied by a single lamp or aggregated through a combination of various lamps. To achieve uniform colour temperature within a space, it is advisable to utilise lamps that offer stepless dimming capabilities.
