"dull glow" is correct and usable in written English.
It typically refers to a soft and faint light, often found in dimly-lit or nighttime settings. For example, "The moon cast a dull glow over the horizon, blanketing the quiet city in a peaceful darkness."
In the far distance we can see the dull glow of Puerto Ayora to our stern.
Everyone knew their dull glow could only warm planets that happened to orbit close by.
From Palangkarya in Borneo to Kuala Lumpur in Malaysia, the air has been thick, the sun a dull glow and face masks obligatory.
The fire of youth fades to a dull glow, or flickers out altogether; the injustice that once seemed so offensive becomes more bearable, perhaps ameliorated by the trappings of success.
Like Benedict, Wills emphasizes the eschatological power of Jesus' message, and the revolutionary fire that his words, now banked to a dull glow by familiarity, kindled in his contemporaries.
The neckpiece was gold, with a rich, dull glow, not unlike the gilded "dog collar" I must have stored in the bottom of my jewelry drawer 15 years ago.
But that didn't dull the glow even the slightest.
All night, Marysville was lit by a dull, smoky glow as its buildings burned down.
IN the sky, blinding flames and showers of green sparks clashed with the dull purple glow," reads one such description.
Sometimes these prompt the father to recall "a dull rose glow in the windowglass" at 1 17 in the morning, the moment when the clocks stopped forever.
Warm objects emit infrared radiation, which is felt by the skin; near T = 950 K a dull red glow can be observed; and the colour brightens to orange and yellow as the temperature is raised.
