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Iwasaki Ignitron 400w High Pressure Sodium Lamp with FEC Starter.

Iwasaki Ignitron 400w High Pressure Sodium Lamp with FEC Starter.

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Here you see a Iwasaki EYE Ignitron NH400F/I 400 watt High Pressure Sodium Lamp with Elliptical Coated Bulb and Internal F.E.C (Ferrule Electrolytic Capacitor) starter which eliminates the need of a seperate Electronic Ignitor, this Lamp is designed for use on a 400 watt High Pressure Sodium/Metal Halide Ballast with the Ignitor disconnected/Removed from the Circuit.

CED-LSON400-T-Lamp.jpg Tungsram-400w-SON-E-Lamp-1.jpg Iwasaki-NH400F-I-E40-HPS-Lamp-1.jpg Iwasaki-NH400F-I-E40-HPS-Lamp-2.jpg

Light Information

Light Information

Manufacturer:Iwasaki Electric Co. Japan
Model Reference:Ignitron NH400F/I
Lamp Type:High Pressure Sodium Lamp
Filament/Radiator Type:Sintered Alumina Oxide Arc Tube
Base:E40 or GES (Goliath Edison Screw)
Shape/Finish:Elliptical Coated
Service Life:24000 Hours
Fixture Type:Industrial, Commercial, Area, Flood & Street Lights
Ballast Type:for 400w HPS/MH Ballasts Only
Location:Personal Collection
Wattage:400 watts
Voltage:100 volts
Current:4.5 amps
Lumen Output:45500 Lumens
Color Temperature:2000 deg K
Color Rendering Index:CRI-25
Dimensions:290mm x 120mm
Factory Location:Japan
Fabrication Date:02B = February 2002
Application/Use:Indoor/Outdoor Lighting

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Jan 23, 2019 at 05:31 PM Author: Globe Collector
I have the NH-T 400/I with the same ferro-electric capacitor starter (which contains no moving parts). I think that this capacitor, visible as the disc in the neck on the right hand image, has a capacitance that varies with voltage.

If you do the "thought experiment" on a hypothetical variable capacitor, let's say 1nF charged to 50v and then REDUCE its capacitance to 100pF, the equation E = 1/2 C(V squared) tells us the voltage will rise to 158 volts when this happens and if it drops to 10pF, the voltage rises to 500!

It is on this principle that this capacitor works, as its capacitance decreases, its charge voltage rises, which causes its capacitance to futher decrease and its voltage to further it is a sort of, "Dog chasing its tail" type of thing.

Very clever design. Similar to how high powered varactor diodes were once used to generate lots of harmonics by slapping them across a high powered R.F. source at about 300MHz, and then the harmonics were filtered off, to give still some useful power, (5-10% of the original 300MHz source) at frequencies up into the 2-4GHz range .... back in the days before really fast GaAs microwave semiconductors existed.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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