"sunlight hours" is a correct and usable phrase in written English.
You can use it to refer to the amount of daylight that is available to be experienced in a day; that is, the amount of time the sun is out. For example, "We really enjoyed the long days in June, with so many extra sunlight hours."
On a recent afternoon, he and his deputies, Victor Estrada and Manny Deleg, had more work than the sunlight hours would allow.
The same group are more likely to be larks, being awakein sunlight hours, rather than owls, who were awake more at night time.
It was not until the next afternoon, during sunlight hours, that they tightened the radio antennas into position and solved the light problem.
China now has about 700 solar panel manufacturers with a combined annual production capacity of 40 gigawatts of electricity — the electric power equivalent, at peak sunlight hours, to the total output of every electrical generating station in New York State.
As I sat down and ordered a cup, the wise locals who had been cloistered inside during the scorching sunlight hours emerged to shop for sticky desserts from a trio of vendors.
For cities shadows present both a technical challenge – one that can be modelled in 3D and measured in "theoretical annual sunlight hours" lost – and an ethereal one, changing the feeling of space and the value of property in ways that are hard to define.
Three of the examples illustrate how the proposed process can be driven by solar energy: a) utilizing direct solar energy; b) inclusion of an external reflector; c) utilizing photovoltaic energy during non-sunlight hours.
Logarithmic transformations were conducted to normalize the distribution of 25(OH D (ng/mL) levels, dietary calcium (mg/d), phytate: calcium ratio, and the sun exposure index (percent body surface area exposed to sunlight × hours of sun exposure/week).
Secondly, the sun exposure index (percent body surface area exposed to sunlight × hours of sun exposure/week) and the economic indicator (affluent: private nursing home versus nonaffluent: government hospital) were significantly associated with the serum 25(OH D levels after adjusting for potential confounding variables.
Furthermore, a higher average sun exposure index (percent body surface area exposed to sunlight × hours of sun exposure/day) has been reported among rural pregnant Indian women in the literature [ 6] compared to our study according to the same definition (35.4 versus 9.2).
Starting in the late 1950s, researchers began to identify total (cumulative) outdoor sunlight exposure hours and sunlight exposure on working and non-working days [ 14- 19] as risk factors for NMSC.
