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Old 02-19-2003, 12:19 PM   #1 (permalink)
Join Date: May 2 2002
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This answer to my past question about wattage, given in Island Sun Times by Wolff.

This Month’s Question:
Take a shot at explaining how the wattage of a fluorescent lamp is determined. Does more wattage equal better tanning capability, or just more power consumption?
The wattage of a fluorescent low-pressure lamp is determined by the lamp design and, more importantly, by the ballast. All of this is influenced by the input voltage to the ballast/lamp system. In simple terms, the ballast will determine the system wattage, so installing a 100W lamp in a higher-wattage ballast (say 120W/1200mA) will result in approximately 120 watts of power consumption.

Wattage is primarily a measure of power consumption, not necessarily irradiance (output). Wattage is also a measure of heat. One watt = 3.412 BTUs. British Thermal Units are a heat value standard, and you see this term commonly used in air conditioning. Total wattage of your equipment at actual input voltage, including fans and other onboard electrical devices, tells you the BTUs of air conditioning required to deal with the heat load. This is something to keep in mind if you are ‘upgrading’ a few smaller beds to larger beds with more lamps/wattage/BTUs… your HVAC provider should be consulted to be certain your air conditioning is adequate.

In our industry, there is a move to higher-wattage sunlamps versus the standards of 100W and 160W. The standard sunlamp envelope is F71/T12/Bi-Pin. In its 100W iteration, the internal environment of the lamp is tough; at 160W, it is almost hostile. Increasing wattage further magnifies this effect, thus the shorter service life to be expected with increasing wattage due to amplified phosphor degradation and, to some extent, physical wear and tear. Increasing the wattage will increase lamp output, but not in a linear sense. Increasing wattage (and heat) past optimal lamp design by 10 percent yields about 5 percent greater irradiance and 10 percent higher power use. Keep in mind that in each of these scenarios, the lamp is the same size – you’re just demanding more out of it.

So, the answer to the question is: All other things being equal, increasing fluorescent sunlamp wattage results in increased output and power consumption. That is not to say that it is wise to put 100W lamps in 160W equipment… cathode and mount designs are very different for these two lamp styles, and this kind of misapplication will certainly disappoint you. Whether a sunlamp is a reflector or full-coat, the wattage does not change due to the reflector… radiant heat is directed differently by reflector lamps, but there is not more of it.

Since tanning equipment of any size (or wattage, or UV source) can only deliver a maximum session equaling a dose of 4 MEDs, there are reasons for higher wattage:

• Aesthetics/ergonomics – greater lamp irradiance allows for longer exposure distances so the unit can look the way the designer wants (or just be bigger);

• Economics 1 – greater irradiance allows for shorter maximum session times in like-sized equipment, thus higher tanner throughput and revenue for the salon;

• Economics 2 – same size equipment and same exposure time allows for fewer lamps, reducing component count and cost for the producer and lower prices to the equipment buyer.

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Old 02-20-2003, 09:55 AM   #2 (permalink)
Join Date: Aug 8 2001
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For the most effective tanning and lamp longevity to occur it is projected the best through complete matching of the ballast to lamp output. To conserve electricity, prolong lamp life and stabilize a very fluxiuating ballast, a capacitor is required to monitor the driving force of the lamp (choke ballast). Now, if a capacitor is connected to a large group of ballast situated in a series circuit, doesn't it appear to make sense that the first lamp through the last lamps will receive varied charges (resistance facators & lenth and time of discharge). If a small group of these ballast are connected in a series-parallel circuit the discharge rate will be minimized and occur more rapidly, therefore creating better control with relationship to output and lamp longevity (reduction in starving lamp phospher requirements to optimally burn).

A circuit such as this is used in the production of all puretan systems and connoted as "Pennac-Energy". Output is increase from 12 to 22%, depending on what system it is compared to. The electrical operating expense (amperage use) is decreased. This patented design is unsurpasssable by any system. Our TanScene lines also incorporate this feature that we build. By compiling this with acrylic distance, lamp overlaps and canopy to sunbed distance major output factors in the technical design of a tanning apperatus are definate. We have educated ourselves in these factors and are very proud of the results that has recently been found through Don Smith and his testing lab experts.

You input is very good for the industry business owners. It appear that you have done some research and tought yourself well. This type of information only sustains you are an individual that is interested in gaining all the information available to assist you in your success. If I may be of asssitance to you, please notify me.

Roger Brown-puretan International
800/338-8267 x201 or rogerb@puretan.net
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