| Electronics > Projects, Designs, and Technical Stuff |
| Fluorescent lamp ballast question |
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| iXod:
This is actually in a small photographer’s light table, used to view transparency film. |
| james_s:
--- Quote from: iXod on August 11, 2019, 07:33:53 pm --- --- Quote from: themadhippy on August 11, 2019, 11:33:04 am ---not in the uk,how many do you want? https://www.tlc-direct.co.uk/Main_Index/Lighting_Menu_Index/Lighting_Fluorescent_Index/Flo_Control_1/index.html#Control_Gear --- End quote --- They probably don't have any 120v 30W chokes (using a separate starter, not switch-start) do they? In the land of 240v and household 3-phase... --- End quote --- I think 22W is as high as it ever got for choke ballasts on 120V, lamps up to about 24" in length. For HID lamps you could get HPS (SON) chokes up to 100W, there are two types of 100W HPS lamp, one that operates at around 50V for 120V choke ballast applications and one that operates around 100V. Larger lamps were occasionally used on choke ballasts where 240, 277 or 480V was available in commercial/industrial settings but 120V mandates the use of autotransformer ballasts. |
| iXod:
--- Quote from: james_s on August 11, 2019, 07:39:36 pm ---I think 22W is as high as it ever got for choke ballasts on 120V, lamps up to about 24" in length. --- End quote --- Crikey. I can’t even remember my lamp size. They are 20W lamps of course. But UK won’t have any 120V product. Not interested in HIDs. |
| themadhippy:
--- Quote ---using a separate starter, not switch-start) --- End quote --- switch start means it uses a starter,the type without starters are commonly known as quick start. --- Quote ---But UK won’t have any 120V product. --- End quote --- But we've got plenty of 110v stuff,normally found on building sites. |
| james_s:
That depends on where you are. When I hear "switch start" I think of the inexpensive fluorescent desk lamps that were once common, where instead of a starter the power switch is a momentary contact wired as a starter would be. To turn on the lamp you hold down the power button until the ends glow and then release it and the tube starts. To turn it off the switch interrupts the power. The most common magnetic ballasts for larger lamps in the US are "rapid start" which are autotransformers with separate windings to heat the cathodes. There are also "instant start" types that use a high enough voltage to strike the lamps without heating the cathodes, although this generally leads to shorter lamp life. |
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