 Practical Illuminosity
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radiotech
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Mon May 31 2010, 05:08PM
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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
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Some lights are needed for storm backup. The system now has
fluorescent/inverters/battery. LED's were tested but the light was
unusable. The inverters will cut out on low voltage, leaving a usable reserve charge in the batteries.
Some lamps using 13 watt biax bulbs were tested (portable trouble lights) (12 volt ) whose balast/inverter will continue without cutout on low voltage for hours with dim output (but wont strike-up in full conduction mode, if switched off). This happens at about 6 volts.
The argon component in the Penning mix, seemingly is capable of sustaining phosphor excitation but not at the 253.7 nM line the mercury arc has. (Or perhaps the excitation is from the weaker, non-forced, 253.7 Hg line)
And on low voltage, when the cathanode temperature drops too low to provide emmision coupling, the inverter
puts out enough high voltage to switch the tube into a cold cathode mode.
This jump down step in light is exactly what used to happen if fluorescent lamp dimmer systems of old were misadjusted, or when the tubes got old.
Comments?
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