Lanterns/Fixtures > Modern
Introducing Vince Electric on Gallery of Lights!
Jace the Gull:
I have actually figured and thought of few ways to do EOL.....such as temperature detection, lumen sensor....when MV gets dimmer it actually gets hotter...so if there was a combo of lumen and temp sensor to see when its "ready" for EOL and "Resets the streetlight" until new lamp is installed
Medved:
--- Quote from: A_lights on January 04, 2010, 07:24:36 PM ---Lumen depreciation would not be a problem with the lifeguard features, until 60,000 Hrs or so. Then the ballast could be designed to shut off.
--- End quote ---
Lifeguard increased the life to the ~20000 hour level, otherwise it was about half - counting for limit 70% of initial lumens...
Medved:
--- Quote from: TiCoune66 on January 04, 2010, 08:00:35 PM ---It's pretty hard to design a mercury ballast that would shut off at end of life because the voltage in a mercury lamp doesn't rise up too much throught its life.
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More useful would be lumen feedback regulating lamp power for given light output - it is not necessary to spend full rated power, when the fresh lamp would give 40% more lumens then needed:
Assume you want to use 175W MV/DX. Let say such lamp has 10000lumens at full power when new, but 7000lumens at EOL, so lighting installation would be designed for 7000lumen/lamp. In such installation brighter lamp has no added value (but dimmer lamp mean "not working", as the required illumination would not be met)
So the ballast would be set to regulate 7000lumens/lamp. When the lamp is fresh, ~125W would suffice. As the lamp age, it will loosen it's efficacy, so the ballast would accordingly increase the power to keep the required 7000lm level. At the lamp EOL the ballast would reach 175W power level and at this point set a "Replace lamp immediatelly" flag (and in home yardblasters do not light next time to enforce the owner to replace the lamp). With such system the designed illumination level would be met exactly like with standard 175watter, but with ~15..20% energy usage reduction.
An improvement would be to control the illumination level by this system - as during e.g. full moon lumen requirements are lower, so the wattage might be reduced further - of course with some "minimum clamp"...
Jace the Gull:
--- Quote from: Medved on January 06, 2010, 02:14:44 PM ---
--- Quote from: A_lights on January 04, 2010, 07:24:36 PM ---Lumen depreciation would not be a problem with the lifeguard features, until 60,000 Hrs or so. Then the ballast could be designed to shut off.
--- End quote ---
Lifeguard increased the life to the ~20000 hour level, otherwise it was about half - counting for limit 70% of initial lumens...
--- End quote ---
I have three MV lamps two /W and one /C Westies that was in service for ALMOST 40 years (38-39 years to be exact) and they are a lot brighter than my Philips MV from 1992 and many of my well used 1997 MV lamps!!!!
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