Some Trivial Information, Regarding Ultra Violet Radiation
As discussed in previous Message Threads, I did some work for a Client who owned several Tanning Salons. I was asked to Bid on a new TI for this Client, where the Improvement was to incorporate an adjacent unoccupied Suite, to the then-currently leased Space.
In addition to the General Lighting, HVAC, Misc. Receptacles and Office outlets, the new Conditioned Space also included:
a. (6) 120/240V 20 Amp Tanning Beds - with 12 to 16 F72 T12 VHO Fluorescent Lamps per Unit,
b. (2) 120/240V 30 Amp Tanning Booths (Upright) - with 24 F72 T12 VHO Fluorescent Lamps per Unit,
c. (1) 10KW High Intensity Tanning Bed.
This was a very good Client, and we both learned from each other.
The Time Period was somewhere in mid 1992; around the Time when Intel introduced the 80486-DX2.
My knowledge base regarding Discharge Lighting was minimal at best, so it was time for me to dive in to Discharge Lighting Components and related Theories.
This lead to several years of studies, but the basics were grasped within a couple Months.
The High Intensity Tanning Bed was the "Push" to study all components involved.
This Unit consisted of (5) individual 2000 Watt High Pressure Mercury Lamps with Quartz Glass Envelopes.
Each Lamp had its own 3500 VA Tapped Magnetic Linear Reactor to Ballast the Lamp, and a High Voltage Pulse Ignitor mounted remote from the Lamp, yet within 18" of the Lamp.
Each Lamp incorporated Dichroic Filters - One "Clear" and One "Purple Tinted".
The Tinted Filter was thinnest - about 0.25" wide, whereas the Clear Filter was thickest - around 1.5" wide.
The combination of Dichroic Filters greatly reduced the UVB levels reaching the User, and completely reflected the UVC produced by the Lamp.
IIRC, the three levels of UV Emissions have the following results / constraints / parameters:#1: UVA:
a. Not Absorbed by Glass,
b. Oxidizes Melanin,
c. Passes through the Upper Atmospheric Layers, and through the Gases between the Stratosphere and Troposphere with minimal losses at Earth Ground Level,
d. Not Blocked or Reflected by Dioxygen (O2), or Ozone (O3).#2: UVB:
a. Causes Sunburns,
b. "Brings" Melanin to the Surface of the Skin,
c. Most is Filtered out by O3 prior to reaching Earth at Ground Level (pass below Troposphere demarcation)#3: UVC:
a. Mercury Vapor Emission Wavelength is in the UVC range,
b. Not Filtered by Quartz Glass Envelopes,
c. Will be Blocked by O2.
Oh, and contrary to the "Report" which started this thread, Tungsten-Halogen Incandescent Lamps Produce / Emit UV Radiation.
The "Report" stated Incandescent Lamps did not Produce / Emit UV "Light".
In the quest to study and be aquainted with Discharge Lighting Equipment, the scope covered areas of:
- Electromagnetic Radiation,
- Transduction of UV emission to the visible Spectrum,
- Negative Resistance,
- Illumination Theories,
- Light and True Power relationships,
- Current Limiting Devices (Ballasts),
- Details of Discharge Lamp Operations,
- Details per the Operation, Designs, and Theories of Linear Magnetic Reactors.
If not for this Client, I would not been so inclined to study so heavilly and at an early time in my life!
My Career was positively influenced by the optimistic attitude and suggestions by this Client, along with the introduction to a whole new world of Electrophysics, etc.
Now I rant and spew out Techno-Babble, and use terms and definitions of Jargon and Engineer-eeze to describe simple things...
-- Scott (EE)