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Hi,Im just a fresher as design engineer. While browsing, I read that 330ohms resistor has to be placed parallel across an LED light, can someone tell me if it is necessary and why?
 
Got to get ,parallel series definition sorted !
330 ohm in series sounds more likely , or will dissipate 43W at 120V or worst .!!
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A higher value may be in parallel to prevent , blinking when they are off due to
capacitive pickup !
 
Thankyou @static zap @HexHex :)

So do resistors have to be kept both parallel and in series..
How do I discern the values of the transistors and is it a mandate for LED Retrofit?? I intend on retrofitting with Type B LEDs and so would bypass the ballasts but the same fixtures.
 
I have no firm value answers , inrush is very dependent on actual device used ,and quantity that are simultaneously switched. (Industrial/factory situ)
Resistors are in-efficient , practical solutions may involve
NTC or PTC devices when you better understand
which problem (Inrush I /nuisance blinking is being solved)
.....
( apologies my answers are for thought /design concept
rather than a practical design)
 

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