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DennisN
Tired Old Man
Joined: Feb 27, 2006
Posts: 14907
Location: Keynsham
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 Posted: Fri Aug 12, 2011 12:42 am Post subject: |
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| M8TJT wrote: | Let’s take a 25w tube. This burns 200 watthours in 8 hours at a current of approximately 100ma @240v.
Let’s say the tube takes 10 seconds to start (an over estimate).
If the myth is true then the tube will take the ratio of 8hoursto 10 seconds of current to start for a period of ten seconds. The ratio of 10 seconds to 8 hours is 2880 which means that the start current will be this number times the running current which is 288A for 10 seconds or 576A if it starts in 5 seconds. Obviously a ridiculous figure, so obviously an urban myth, as I said. |
You forgot  to take away the number you first thought of!!!  Doesn't look such a ridiculous figure then, does it? Probably only about 14.
I thaw an urban myth thith morning in the paper thop. Thaid "Good morning thir, have a nithe day".  I told her to put her teeth in.
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Fri Aug 12, 2011 2:39 pm Post subject: |
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| M8TJT wrote: | | Further reading Here |
Good find M8TJT,
Myth comprehensively busted!
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"Settling in nicely" ;-) |
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Guivre46
Frequent Visitor
Joined: Apr 14, 2010
Posts: 1262
Location: West London
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| Posted: Fri Aug 12, 2011 4:37 pm Post subject: |
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Oh!  and 
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Mike R [aka Wyvern46]
Go 530T - unsupported
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Fri Aug 12, 2011 4:53 pm Post subject: |
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| Andy_P wrote: | | M8TJT wrote: | | Further reading Here |
Good find M8TJT, Myth comprehensively busted! |
I should be on Freeview 38  |
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DennisN
Tired Old Man
Joined: Feb 27, 2006
Posts: 14907
Location: Keynsham
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| Posted: Fri Aug 12, 2011 7:31 pm Post subject: |
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| Quote: | Actual Lamp Life =
Rated Lamp Life x f(u) where, f(u) =
1.71 (1-exp[-(u/3.89)^0.505]) u =
burning cycle, hours of operation per start |
Blimey, that's not what my old granny says f(u) means!
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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AliOnHols
Pocket GPS Verifier
Joined: Oct 15, 2008
Posts: 1942
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| Posted: Fri Aug 12, 2011 8:39 pm Post subject: |
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Great Myth Busting M8TJT. If only I "knew" you while my parents were still alive; my inheritance may have been more than £3.68!
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