Here are Todays Amazing Lamp Fluorescent Lighting Deals
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 T5 Grow Light Hydroponics 324W 6 Lamps 6500K Veg Bulbs 48 4 ft Sun 324W $124.99 Time Remaining: 12d 12h 14m Buy It Now for only: $124.99 Buy It Now | Add to watch list |
 90W watt UFO HYDROPONIC PLANT LED GROW LIGHT USA $79.49 Time Remaining: 2h 39m Bid now | Add to watch list |
 24 T5 Fluorescent Grow Light 2 6400K PL Tek Floro Veg Bulb Hydroponic CFL Lamp $79.95 Time Remaining: 4h 46m Buy It Now for only: $87.95 Buy It Now | Bid now | Add to watch list |
 POWER STRIP SURGE GROW LIGHT TIMER 8 OUTLET 15 AMP 24 H $28.90 Time Remaining: 3d 3h 38m Buy It Now for only: $28.90 Buy It Now | Add to watch list |
 24 T5 Fluorescent Grow Light 2 3000K PL Tek Floro Veg Bulb Hydroponic CFL Lamp $79.95 Time Remaining: 4h 46m Buy It Now for only: $87.95 Buy It Now | Bid now | Add to watch list |
 8 Pack T5 GROW BLOOM BULBS Tubes VEG 6500K 3000K Light Lamps Blue Red 4 ft 48 $32.95 Time Remaining: 24d 9h 5m Buy It Now for only: $32.95 Buy It Now | Add to watch list |
 HYD 92 Portable Insect KillerMosquito Killer Lamp bug zapper $60.00 Time Remaining: 5h 38m Bid now | Add to watch list |
 Hydroponic 225 LED Grow Light Panel Blue White 13w 12 Aquarium Coral Reef Lamp $37.90 (1 Bid) Time Remaining: 5h 42m Bid now | Add to watch list |
 6 INCH INLINE HYDROPONIC AIR CARBON FILTER ODOR CONTROL $64.89 Time Remaining: 25d 7h 44m Buy It Now for only: $64.89 Buy It Now | Add to watch list |
 HYD 92 Portable Insect KillerMosquito Killer Lamp bug zapper $60.00 Time Remaining: 5h 47m Bid now | Add to watch list |
 4 Bulb 8 Tube T5 HO Grow Light Hydroponic 2ft 4ft 48 Bloom Veg Fluorescent Lamp $59.99 Time Remaining: 12d 12h 13m Buy It Now for only: $59.99 Buy It Now | Add to watch list |
 12v Blue Red Mixed 225 LED Grow Light Panel Indoor Garden Hydroponic Plant Lamp $32.90 Time Remaining: 6h 6m Buy It Now for only: $36.90 Buy It Now | Bid now | Add to watch list |
 90W QUAD BAND LED GROW LIGHT UFO 90 WATT QUADBAND $118.99 Time Remaining: 7h 43m Bid now | Add to watch list |
 600w HPS GROW LAMP 600 watt SODIUM Lights w Hydroponics Bulbs digital ballast ok $32.45 Time Remaining: 14d 10h 42m Buy It Now for only: $32.45 Buy It Now | Add to watch list |
 All Red 450 LED Grow Light 2 Panel 28w Budding Flowering Hydroponic Plant Lamp $56.90 Time Remaining: 8h 42m Buy It Now for only: $62.90 Buy It Now | Bid now | Add to watch list |
 Quad band 450 LED Grow Light Panel Hydroponic Plant Lamp Blue Red Orange White $59.90 Time Remaining: 12d 15h 29m Buy It Now for only: $59.90 Buy It Now | Add to watch list |
 400w MH Conversion Bulb Hydroponics 400 watt Sodium Metal Halide w hps hortilux $21.50 (3 Bids) Time Remaining: 10h 16m Bid now | Add to watch list |
 600 watt DIGITAL HPS Bulb GROW Lamp SODIUM w digilux type 600w X hortilux eye mh $36.00 (11 Bids) Time Remaining: 10h 22m Bid now | Add to watch list |
 4 inch INLINE DUCT BOOSTER FAN exhaust blower cooling $19.89 Time Remaining: 6d 4h 2m Buy It Now for only: $19.89 Buy It Now | Add to watch list |
 600 watt MH HPS CONVERSION GROW LIGHT BULB Sodium to Metal Halide 600w w lamp $17.00 (4 Bids) Time Remaining: 10h 27m Bid now | Add to watch list |
 2 PK 16 WALL MOUNT FAN Mountable Oscillating Hydroponics Grow air active inch $64.98 Time Remaining: 25d 4h 16m Buy It Now for only: $64.98 Buy It Now | Add to watch list |
 6 x 18 CARBON AIR FILTER ODOR CONTROL SCRUBBER activated coal charcoal inch fan $26.00 (5 Bids) Time Remaining: 10h 30m Bid now | Add to watch list |
 400 watt HPS High Pressure Sodium Grow Light bulb 400w w lamp hydroponics bloom $5.69 (6 Bids) Time Remaining: 10h 41m Bid now | Add to watch list |
 4 x 50 MYLAR REFLECTIVE FILM Hydroponics 2mil thick $29.15 Time Remaining: 28d 5h Buy It Now for only: $29.15 Buy It Now | Add to watch list |
 6 REFLECTOR HOOD w GLASS AIR COOLED GROW LIGHT HYDROPONICS SIX INCH VENTS COOL $34.86 (16 Bids) Time Remaining: 10h 49m Bid now | Add to watch list |
 General Hydroponic Flora Series Nutrient 3 QUARTS 32 oz $36.95 Time Remaining: 28d 9h 22m Buy It Now for only: $36.95 Buy It Now | Add to watch list |
 48x24x48 GROW TENT BEST Mylar Hydroponics 4x2x4 MOTHER KEEPER Clone Room $51.00 (2 Bids) Time Remaining: 10h 55m Bid now | Add to watch list |
 6 INCH INLINE EXHAUST VENT FAN BLOWER DUCT AIR SIX WORKS WITH A CARBON FILTER $71.00 (15 Bids) Time Remaining: 11h 5m Bid now | Add to watch list |
 400w 400 watt HPS MH Grow Light System Set Premium Kit Dimm Green House iPower $134.90 Time Remaining: 19d 10h 8m Buy It Now for only: $134.90 Buy It Now | Add to watch list |
 24 T5 Fluorescent Grow Light 2 3000K PL Tek Floro Veg Bulb Hydroponic CFL Lamp $69.95 Time Remaining: 11h 42m Buy It Now for only: $76.95 Buy It Now | Bid now | Add to watch list |
 1000w 1000 watt Digital HPS MH Grow Light System Set $233.90 Time Remaining: 9d 13h 52m Buy It Now for only: $233.90 Buy It Now | Add to watch list |
 6 COOLTUBE AIR COOLED GROW LIGHT REFLECTOR COOL TUBE hps mh 400 600 glass hood $33.00 (5 Bids) Time Remaining: 11h 47m Bid now | Add to watch list |
 NEW 1000 watt DIGITAL HPS Bulb GROW Lamp SODIUM w 1000w digilux type X hortilux $5.50 (2 Bids) Time Remaining: 11h 47m Bid now | Add to watch list |
 SPEEDSTER Inline Fan Speed Control Controller Variable $24.34 Time Remaining: 9d 9h 24m Buy It Now for only: $24.34 Buy It Now | Add to watch list |
 150w HPS GROW LIGHT SYSTEM Complete w 150 WATT BULB Mini Sun Sodium ballast lamp $56.00 (27 Bids) Time Remaining: 12h 1m Bid now | Add to watch list |
 600w 600 watt HPS MH Grow Light System Set Premium Kit $164.90 Time Remaining: 28d 10h Buy It Now for only: $164.90 Buy It Now | Add to watch list |
 DUAL OUTLET DIGITAL GROW LIGHT TIMER 2 plug 7 DAY WEEK 24 hour programmable lamp $7.00 (12 Bids) Time Remaining: 12h 21m Bid now | Add to watch list |
 60x 100x LED Zoom Microscope Pocket Magnifier Portable eye active grow light $8.00 Time Remaining: 12h 42m Bid now | Add to watch list |
 T5 GROW LIGHT FLUORESCENT FLORO T5HO BLOOM HIGH OUTPUT $49.95 Time Remaining: 1d 3h 31m Buy It Now for only: $49.95 Buy It Now | Add to watch list |
 QUAD BAND Pro Hydroponic 90w UFO LED Plant Grow Light $79.49 Time Remaining: 12h 52m Bid now | Add to watch list |
 4 Pack T5 GROW bulbs BLOOM or VEG tubes Light Lamps Blue Red 4 ft 48 warm cool $36.85 Time Remaining: 25d 5h 9m Buy It Now for only: $36.85 Buy It Now | Add to watch list |
 900 LED Grow Light White 4 Panel Hydroponic Veg Clone Bloom Aquarium Lamp 144w $289.95 Time Remaining: 13h 22m Buy It Now for only: $322.95 Buy It Now | Bid now | Add to watch list |
 DIMMABLE 1000W DIGITAL GROW LIGHT BALLAST HPS 1000 watt Sodium Halide x quantum $102.50 (13 Bids) Time Remaining: 13h 55m Bid now | Add to watch list |
 50L EXPANDED CLAY PEBBLES HYDROPONIC GROW ROCK HYDROTON $24.99 Time Remaining: 20d 6h 54m Buy It Now for only: $24.99 Buy It Now | Add to watch list |
 Blue Red 450 LED Grow Light 2 Panel 60w Hydroponic Plant Lamp Veg Clone Bloom $149.95 Time Remaining: 15h 2m Buy It Now for only: $166.95 Buy It Now | Bid now | Add to watch list |
 T5 LIGHT BULBS FLUORESCENT LAMPS T5HO F54 T 5 TUBES HO $19.95 Time Remaining: 4d 2h 57m Buy It Now for only: $19.95 Buy It Now | Add to watch list |
 8 Lamps 4Ft T5 HO Fluorescent Grow Light 48 Bloom Veg Bulb 95 German Reflector $199.95 Time Remaining: 16h 42m Buy It Now for only: $220.95 Buy It Now | Bid now | Add to watch list |
 Wholesale 16x 225 LED Grow Light Panel 224W Blue Red Mixed Hydroponic Plant Lamp $379.90 Time Remaining: 16h 42m Buy It Now for only: $419.90 Buy It Now | Bid now | Add to watch list |
 Premium T5 HO 2 ft 4 Lamp System w Grow Light Bulbs $85.95 Time Remaining: 9d 13h 59m Buy It Now for only: $85.95 Buy It Now | Add to watch list |
 24 T5 Fluorescent Grow Light 2 3000K 6400K PL Tek Veg Bulb Hydroponic CFL Lamp $79.95 Time Remaining: 17h 2m Buy It Now for only: $87.95 Buy It Now | Bid now | Add to watch list |
 10 x 25 ft PANDA FILM B W POLY Black and White HEAVY DUTY Plastic Pandafilm 50 $28.44 Time Remaining: 16d 6h 13m Buy It Now for only: $28.44 Buy It Now | Add to watch list |
 24 3000K T5 HO Fluorescent Grow Light 4 Lamps 2Ft 96w Bloom Bulb 95 Reflector $84.95 Time Remaining: 17h 2m Buy It Now for only: $93.95 Buy It Now | Bid now | Add to watch list |
 All Blue 225 LED Grow Light Panel 14w Stimulate Growth Hydroponic Plant Lamp $22.95 Time Remaining: 17h 42m Buy It Now for only: $25.95 Buy It Now | Bid now | Add to watch list |
 COOL TUBE with XL WING iPower DIMM 600w 600 watt HPS MH Grow Light System Kit $198.90 Time Remaining: 28d 12h 26m Buy It Now for only: $198.90 Buy It Now | Add to watch list |
 Mosquito Insect Bug Fly Killer Catcher Trap Zapper Lamp $9.99 (1 Bid) Time Remaining: 17h 58m Bid now | Add to watch list |
 6 COOLTUBE AIR COOLED GROW LIGHT REFLECTOR COOL TUBE $69.94 Time Remaining: 6d 7h 28m Buy It Now for only: $69.94 Buy It Now | Add to watch list |
 Red Blue Orange 90w 453w UFO LED Plant Grow Light 711 US Shipping $113.69 Time Remaining: 20h 2m Bid now | Add to watch list |
 Red Blue Orange 90w 453w UFO LED Plant Grow Light 3W leds US Shipping $112.99 Time Remaining: 20h 6m Bid now | Add to watch list |
 10 x 100 ft Panda Film Black and White Poly Pandafilm $74.89 Time Remaining: 8h 55m Buy It Now for only: $74.89 Buy It Now | Add to watch list |
 QUAD BAND Pro Hydroponic 90w UFO LED Plant Grow Light US Shipping $122.69 Time Remaining: 20h 49m Bid now | Add to watch list |
 HEAT MAT starting Seeds Germination 10x20 tray seedling propogation Sprout flat $23.85 Time Remaining: 17d 10h Buy It Now for only: $23.85 Buy It Now | Add to watch list |
 QUAD BAND Pro Hydroponic 90w UFO LED Plant Grow Light US Shipping $123.68 Time Remaining: 20h 51m Bid now | Add to watch list |
 T5 Grow Light Fluorescent 8 Lamps 6500K Bulbs Veg 48 4 ft Sun Hydroponics R48 $144.95 Time Remaining: 1d 52m Buy It Now for only: $159.95 Buy It Now | Bid now | Add to watch list |
 2 pcs 6 INLINE DUCT FAN EXAUST BOOSTER BLOWER case inch six grow light cool air $47.93 Time Remaining: 9d 4h 39m Buy It Now for only: $47.93 Buy It Now | Add to watch list |
 T5 Grow Light 48 4 Ft 4 Lamp 6500K Bulbs Hydroponics Veg 44 Sun 216W Used R44 $90.75 Time Remaining: 1d 59m Buy It Now for only: $99.95 Buy It Now | Bid now | Add to watch list |
 B4040 KAZ Stinger BUG ZAPPER light BULB u bend UV40 $24.99 Time Remaining: 8d 19h 18m Buy It Now for only: $24.99 Buy It Now | Add to watch list |
 All Blue 450 SMD LED Grow Light Panel 70w Stimulate Growth Hydroponic Plant Lamp $149.95 Time Remaining: 1d 4h 12m Buy It Now for only: $166.95 Buy It Now | Bid now | Add to watch list |
 Quad band 225 LED Grow Light Panel Hydroponic Plant Lamp Blue Red Orange White $34.95 Time Remaining: 1d 4h 42m Buy It Now for only: $38.45 Buy It Now | Bid now | Add to watch list |
 Quad band 225 LED Grow Light Panel Hydroponic Plant Lamp Blue Red Orange White $34.90 Time Remaining: 12d 15h 29m Buy It Now for only: $34.90 Buy It Now | Add to watch list |
 Blue Red Mix 450 LED Grow Light 2 Panel 28w Indoor Garden Hydroponic Plant Lamp $56.90 Time Remaining: 1d 7h 46m Buy It Now for only: $62.90 Buy It Now | Bid now | Add to watch list |
 SunBlaster 2ft Fluorescent T5 Grow Light 24w T 5 High Output Hydroponics $27.95 Time Remaining: 17d 9h 45m Buy It Now for only: $27.95 Buy It Now | Add to watch list |
 All Red 225 LED Grow Light Panel 14w Budding Flowering Hydroponic Plant Lamp $32.90 Time Remaining: 1d 8h 47m Buy It Now for only: $36.90 Buy It Now | Bid now | Add to watch list |
 Quad band 900 LED Grow Light Panel Hydroponic Plant Lamp Blue Red Orange White $109.95 Time Remaining: 1d 9h 26m Buy It Now for only: $120.95 Buy It Now | Bid now | Add to watch list |
 Quad band 900 LED Grow Light Panel Hydroponic Plant Lamp Blue Red Orange White $109.90 Time Remaining: 12d 15h 29m Buy It Now for only: $109.90 Buy It Now | Add to watch list |
 225 LED Grow Light Panel Blue White Hydroponic Veg Clone Bloom Aquarium Lamp 33w $79.95 Time Remaining: 1d 9h 42m Buy It Now for only: $89.95 Buy It Now | Bid now | Add to watch list |
 3 GALLON PLANT FABRIC GROW POTS Prune smart 10 lot 10 $34.95 Time Remaining: 5d 9h 51m Buy It Now for only: $34.95 Buy It Now | Add to watch list |
 108 LED Grow Light Panel 10mm 40w 12 Aquarium Coral Reef UFO Lamp Blue White $84.90 Time Remaining: 1d 11h 42m Buy It Now for only: $94.90 Buy It Now | Bid now | Add to watch list |
 Sun System T5 High Output Fluorescent Lights and Fixture $100.00 (1 Bid) Time Remaining: 1d 12h 5m Bid now | Add to watch list |
 CASE 25 T5 BLOOM RED BULBS 4 F54T5 HO 48 GROW LIGHT LAMPS 3000K FLOWER foot ft $129.95 Time Remaining: 10d 8h 24m Buy It Now for only: $129.95 Buy It Now | Add to watch list |
 Hydroponic 450 LED Grow Light Blue White 2 Panel 26w 2 Aquarium Coral Reef Lamp $65.90 Time Remaining: 1d 13h 42m Buy It Now for only: $73.90 Buy It Now | Bid now | Add to watch list |
 6 DUCT MUFFLER Inline Fan SILENCER NOISE REDUCER inch SIX can $57.85 Time Remaining: 26d 3h 8m Buy It Now for only: $57.85 Buy It Now | Add to watch list |
 Quad band 450 LED Grow Light Panel Hydroponic Plant Lamp Blue Red Orange White $59.95 Time Remaining: 1d 15h 2m Bid now | Add to watch list |
 Blue Red Mix 450 LED Grow Light 2 Panel 28w Indoor Garden Hydroponic Plant Lamp $56.90 Time Remaining: 1d 15h 22m Buy It Now for only: $62.90 Buy It Now | Bid now | Add to watch list |
 T5 Grow Light 23 2 Ft 4 Lamp 6500K Bulbs Hydroponics Veg 96W $78.99 Time Remaining: 12d 12h 14m Buy It Now for only: $78.99 Buy It Now | Add to watch list |
 T5 Grow Light 48 4 Ft 4 Lamp 6500K Bulbs Hydroponics Veg 44 Sun 216W Used R44 $95.95 Time Remaining: 1d 17h 11m Buy It Now for only: $105.55 Buy It Now | Bid now | Add to watch list |
 90W QUAD BAND LED GROW LIGHT UFO 90 WATT QUADBAND 3W leds $117.32 Time Remaining: 12d 18h 55m Buy It Now for only: $117.32 Buy It Now | Add to watch list |
 12v Blue Red Mixed 225 LED Grow Light Panel Indoor Garden Hydroponic Plant Lamp $32.90 Time Remaining: 1d 17h 22m Buy It Now for only: $36.90 Buy It Now | Bid now | Add to watch list |
 Mosquito Insect Bug Fly Killer Catcher Trap Zapper Lamp $9.99 Time Remaining: 1d 21h 39m Bid now | Add to watch list |
 iPower 250w 400w 600w 1000w watt HPS MH Grow Light System Kit Dimm Green House $239.90 Time Remaining: 13d 22h 17m Buy It Now for only: $239.90 Buy It Now | Add to watch list |
 All Red 450 LED Grow Light 2 Panel 28w Budding Flowering Hydroponic Plant Lamp $56.90 Time Remaining: 2d 4h 46m Buy It Now for only: $62.90 Buy It Now | Bid now | Add to watch list |
 4 x 25 ft DIAMOND FOIL MYLAR Reflective Film Poly hydroponic lightite roll feet $23.95 Time Remaining: 24d 7h 30m Buy It Now for only: $23.95 Buy It Now | Add to watch list |
 All Blue 450 LED Grow Light 2 Panel 28w Stimulate Growth Hydroponic Plant Lamp $56.90 Time Remaining: 2d 6h 10m Buy It Now for only: $62.90 Buy It Now | Bid now | Add to watch list |
 24 96W 4x 6400K T5 HO Fluorescent Lamp 2 Grow Light Bulbs Fixture Compact CFL $84.95 Time Remaining: 2d 6h 26m Buy It Now for only: $93.95 Buy It Now | Bid now | Add to watch list |
 10 5 GALLON GROW POTS PLANT FABRIC Prune Smart Container 13x10 Gal Bags Dirt $47.98 Time Remaining: 26d 8h 49m Buy It Now for only: $47.98 Buy It Now | Add to watch list |
 Blue Red Mixed 225 LED Grow Light Panel 14w Indoor Garden Hydroponic Plant Lamp $31.95 Time Remaining: 2d 7h 6m Bid now | Add to watch list |
 225 LED GROW LIGHT PANEL RED BLUE HYDROPONIC LAMP 12V $32.90 Time Remaining: 25d 16h 42m Buy It Now for only: $32.90 Buy It Now | Add to watch list |
 8 Lamps 4Ft T5 HO Fluorescent Grow Light 48 Bloom Veg Bulb 95 German Reflector $199.95 Time Remaining: 2d 12h 2m Buy It Now for only: $220.95 Buy It Now | Bid now | Add to watch list |
 Hydroponic 900 LED Grow Light Blue White 4 Panel 52w 4 Aquarium Coral Reef Lamp $117.90 Time Remaining: 2d 14h 6m Buy It Now for only: $131.90 Buy It Now | Bid now | Add to watch list |
 Grow Light 48 4 Ft 8 Lamps 6500K Bulbs Hydroponic Grow Light Sun 432 Watts $149.90 Time Remaining: 17d 9h 55m Buy It Now for only: $149.90 Buy It Now | Add to watch list |
 Hydrofarm JSV4 4 Foot Jump Start T5 Growing Lamp Grow Light System $27.42 Time Remaining: 2d 14h 30m Bid now | Add to watch list |
More Great Information on Lamp Fluorescent Lighting:
Electronic ballasts for plural lamp fluorescent lighting without feedback circuitry
This invention relates generally to
electronic ballast
for fluorescent lamps, and more particularly to electronic ballasts for fluorescent lamps, which operates in the high frequency range and which, depending upon the embodiments, provides both dimmable and non-dimmable lighting.
Various types of electronic ballasts are known. Magnetic ballasts operate at the frequency of the input power sources, e.g., at 50 or 60 Hz. In recent years, it has been recognized that a considerable increase in efficiency, i.e., the amount of power expended in relation to the lumen output of fluorescent lights, can be obtained, in the order of 40%, if the lamps are operated at higher frequencies, e.g., at frequencies between 30 and 50 KHz, for the non-dimmable ballasts.
These electronic ballasts comprise an input circuit with surge protection, a thermal switch for protection against equipment failures or short circuits, and a noise filter circuit; a full wave rectifier, usually a diode bridge with a smoothing filter across its output; an inverter with an amplifier and a second DC power supply; and an output transformer which is connected to the fluorescent lamps.
The most common fluorescent lamp ballasts are non-dimmable. They have no manual control of the amount of light emitted by the fluorescent lamps. But recently, dimmable types of high frequency ballasts have been disclosed which use a voltage to frequency converter, an amplifier, and a second DC power supply in the inverter, and apply power to the lamps over a frequency range. One such electronic dimmable ballast is disclosed in U.S. Pat. No. 5,192,897 (Vossough et al.). The lamp brightness varies in proportion to the frequency of the power applied to the lamps.
A problem with many of the existing ballasts is that the secondary of the output transformer, which is connected to the lamps is not fully isolated from the primary of the transformer, allowing for a feed back path to the AC power source. This creates a hazardous condition when lamps are being changed because the exposed socket can carry 50 or 60 Hz power. Whereas high frequency power (in the order of 30 or 50 KHz) can cause a burn if the skin is exposed to it, 50 or 60 Hz power can cause shock or electrocution.
While some prior art electronic ballast may be generally suitable for their intended purposes, they nevertheless leave something to be desired from one or more of the following standpoints: safety, reliability, ability to provide power to multiple lamps, simplicity of construction, and cost. Furthermore, there is a need for dimmable ballasts which protect against points of resonance over the range of input frequencies, which cause "blooming" (increased brightness, then dimming), at specific resonant frequencies.
In accordance with one preferred aspect of this invention the non-dimmable ballast comprises, a protection and noise filter circuit, a rectifier and DC filter circuit, an inverter circuit, and an output circuit. The protection and noise filter circuit is arranged to be connected to the source of AC power. The rectifier and DC filter circuit is coupled to the protection and noise filter circuit to provide DC power. The inverter circuit is coupled to the rectifier and DC filter circuit for receipt of the DC power therefrom. The inverter circuit includes a tuned resonant circuit comprising a first capacitor connected in parallel with a tapped inductor. The output circuit comprises an output transformer coupled to the lamps of the load and is arranged for receipt of the high frequency electrical signal from the inverter circuit.
In accordance with another preferred aspect of this invention the dimmable ballast comprises, a control circuit having a dimming control, a voltage-to-frequency conversion circuit connected to the control circuit, a protection and noise filter circuit, a rectifier circuit, an inverter circuit, and an output circuit. The voltage-to-frequency conversion circuit provides an output signal of a variable frequency in response to the dimming control. The frequency is in the range of approximately 20 and 250 KHz. The dimmable ballast additionally comprises means for preventing resonant frequencies over that frequency range.
In accordance with preferred embodiments of the ballasts of this invention the output circuit for both the non-dimmable and the dimmable ballasts comprises a reactor connected to the output transformer and to the lamps. The reactor has a core and a pair of windings wound about the core in a manner which reduces the distributed capacitance in the reactor and in the output transformer. The reactor is connected to and provides power for operating a lighting load of two or four fluorescent lamps. Each of the windings of the reactor has a first and a second end, with the first ends being connected together and with the second ends being connected to the lamps. The windings are wrapped around the core with the first ends being close to the core and with the second ends being further from said core than the first ends.