Fitting some fluorescent lights in a workshop tomorrow for a chipie. I thought I heard somewhere that if you have fluorescent lights on, when using, say, a circular saw, it looks like the blade isnt going round. Anyone else heard of this ?
Flourescent lights & circular saws
- Thread starter Norv
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breezer
yes its true.
its the stobing effect
its anyhthing that rotates not just saws.
some times it can make stuff look like its going backwards
there is a good demo, i will go find it
its the stobing effect
its anyhthing that rotates not just saws.
some times it can make stuff look like its going backwards
there is a good demo, i will go find it
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breezer
as i said it really is called strobinng (or its full name the stroboscopic effect)
you should arange lights to be fed from 3 phases, so that each light is a diffent phase than the next.
demo
although its a fountain, this clip demos the phenomanon very well.
you all know water falls but in this clip it looks like its standing still because the leds are strobing
clciky
you should arange lights to be fed from 3 phases, so that each light is a diffent phase than the next.
demo
although its a fountain, this clip demos the phenomanon very well.
you all know water falls but in this clip it looks like its standing still because the leds are strobing
clciky
Some workshops require incandescent lamps on all rotating machinery or the use of high frequency lighting units to ensure there is no strobe effect.
( flourescents go bright -dim 100 times a second. incandescents do not )
( flourescents go bright -dim 100 times a second. incandescents do not )
Use high frequency fittings?
most people who use workshop machinery should know about this; the incandescent lamp over the machine is quite normal. I've seen machines where it is set to illuminate the workpiece and comes on as soon as the machine is powered up, workshop managers come and shout at anyone who takes the bulb out and tell him he could lose a hand.
If there is aonly a single phase in the workshop you can use lead - lag twin flourescent fittings.
I'm not quite sure how it works, but a capactior is used to make one tube out of the pair strobe alternatly to the other by altering its power factor. (i.e. one tube is lit while the other is off)
I have seen an old factory with alternate single lead - lag fluorescents in a long row, but an incandescent lamp is the easiest bet.
I'm not quite sure how it works, but a capactior is used to make one tube out of the pair strobe alternatly to the other by altering its power factor. (i.e. one tube is lit while the other is off)
I have seen an old factory with alternate single lead - lag fluorescents in a long row, but an incandescent lamp is the easiest bet.
Anyway, I did it properly & used high frequency fittings (thanks to the replys on this forum 
). They were £20 dearer each, than the normal flourescents, but its quite a serious looking workshop & thats what he wanted.
). They were £20 dearer each, than the normal flourescents, but its quite a serious looking workshop & thats what he wanted.
just remember to tell who ever changes lamps when they fail, to make sure the fitting is powered off first. Otherwise you can damage the ballast. They don't take too kindly to high current surges when a new lamps is 'clicked' in place.
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