In this "capstone clip" for the conclusion of 117 YouTube uploads, I have herein lighted up my Big Bright Beacon, originally built and conceived to mirror M 87...
* * * * * * *
Excerpt "Mercury vapor" Courtesy of "History of street lighting in the United States" from Wikipedia (FOR EDUCATIONAL PURPOSES ONLY) http://en.wikipedia.org/wiki/History_... ...As follows:
* * * * * * *
In 1948, the first regular production mercury vapor (MV) streetlight assembly was developed. It was deemed a major improvement over the incandescent light bulb, and shone much brighter than incandescent or fluorescent lights. Initially people disliked them because their bluish-green light made people look like they had the blood drained from them. Other disadvantages are that a significant portion of their light output is ultraviolet, and they "depreciate"; that is, they get steadily dimmer and dimmer with age while using the same amount of energy, and in a few rare instances, they also cycle at the end of their life cycles. Even rarer is they can burn out, especially when the light is being burned while dim (usually at the end of the life cycle). Mercury lamps developed in the mid-1960s were coated with a special material made of phosphors inside the bulb to help correct the lack of orange/red light from mercury vapor lamps (increasing the color rendering index(CRI)). The UV light excites the phosphor, producing a more "white" light. These are known as "color corrected" lamps. Most go by the deluxe (DX) designation on the lamp and have a white appearance to the bulb. Mercury Vapor Bulbs come in either clear or coated with powers of 50, 75, 100, 175, 250, 400, 700 or 1,000 Watts. The Mercury Vapor lamp is considered obsolete by today's standards.
#lighting #eighties #streetlamp
Big Bright Beacon | BBB | Number 87! lighting industry market size | |
| 3 Likes | 3 Dislikes |
| 106 views views | 443 followers |
| Science & Technology View attributions | Upload TimePublished on 8 Nov 2014 |
Không có nhận xét nào:
Đăng nhận xét