Like most animals, full spectrum lighting is most beneficial. However, if you are talking about adding light to the coop in the morning to influence the birds' perception of day length, I have read that lighting in the red/orange spectrum (like that at dawn and dusk) is most effective due to its ability to penetrate the skull and thereby being perceived by the pineal gland.
The primary influence on production is whether day length as opposed to darkness is increasing or decreasing. That's why birds tend to molt after summer solstice and laying is stimulated after winter solstice.
Chickens have superior eyesight to that of humans and can see different wavelengths of light than we can.
Where you locate the added light is important. Lux can vary by quite a bit from point to point in a coop.
Proper use of timers and dimmers is very important. Birds definitely need a good totally dark period daily.
The following articles may provide you with some interesting reading.
https://thepoultrysite.com/articles/the-importance-of-lighting-in-poultry-production
In the following link, especially note the light period in tables 1 and 2.
https://thepoultrysite.com/articles/lighting-for-poultry-housing