Electronics > Beginners
Turning a florescent replacement type A LED T8 into a type B
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dclevy1:

--- Quote from: amyk on July 17, 2018, 01:22:55 am ---
--- Quote from: dclevy1 on July 16, 2018, 05:42:01 am ---Okay type A are LED T8 bulbs that require a ballast to operate because they are supposed to be easy to retrofit into pre-existing fluorescent light fixtures. Type B bulbs are LED T8 bulbs that can be wired directly to 120v ac Mains voltage and you are able to bypass a ballast completely so you can use it as typical lighting.
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That makes it much clearer, thanks. In other words, type A are the ones which don't have a current limiter and rely on the ballast for current limiting, while type B does. Depending on the rated current and voltage, a capacitor or resistive dropper would probably be suitable, but once again you need to post that information.


--- Quote ---If you are willing to help me do you need the item number or model number on the components themselves?
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The marking on the component itself. A clear high-resolution picture would be preferable.

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I will take better pictures on Friday because the camera on my current phone is broken and I'm getting it fixed on that day


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dclevy1:

--- Quote from: dclevy1 on July 18, 2018, 07:04:13 am ---
--- Quote from: amyk on July 17, 2018, 01:22:55 am ---
--- Quote from: dclevy1 on July 16, 2018, 05:42:01 am ---Okay type A are LED T8 bulbs that require a ballast to operate because they are supposed to be easy to retrofit into pre-existing fluorescent light fixtures. Type B bulbs are LED T8 bulbs that can be wired directly to 120v ac Mains voltage and you are able to bypass a ballast completely so you can use it as typical lighting.
--- End quote ---
That makes it much clearer, thanks. In other words, type A are the ones which don't have a current limiter and rely on the ballast for current limiting, while type B does. Depending on the rated current and voltage, a capacitor or resistive dropper would probably be suitable, but once again you need to post that information.


--- Quote ---If you are willing to help me do you need the item number or model number on the components themselves?
--- End quote ---
The marking on the component itself. A clear high-resolution picture would be preferable.

--- End quote ---
I will take better pictures on Friday because the camera on my current phone is broken and I'm getting it fixed on that day


Sent from my iPhone using Tapatalk

--- End quote ---
Okay guys sorry for the long Hiatus but I was able to find a DC negative and positive output to the actual LED array and test voltages. I found that the strip that I want to use is being supplied around 80 volts dc so that means it is powered through parallel and series connections.. so I need to find a high voltage DC Supply can anyone help me out with this.


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james_s:
If you're going to add a DC supply why not just use a ballast?

Otherwise you could take apart a screw in LED bulb and use the driver out of that, or you could try a capacitor dropper.
dclevy1:

--- Quote from: james_s on August 04, 2018, 05:42:40 pm ---If you're going to add a DC supply why not just use a ballast?

Otherwise you could take apart a screw in LED bulb and use the driver out of that, or you could try a capacitor dropper.

--- End quote ---
I won't use a ballast with the existing fixtures that I have because I am completely taking it apart and I want it to be easy to accommodate other strips and parallel other strips. That's why I want to use a DC Supply and it all depends on creative things I want to do with the strips as well so I like to have options. Out of the variety of three different brands of LED T8 I've taken apart I like these the most. These are Sylvania older LED T8 retrofit bulb strips. Sorry for the shity photos my camera on my iPhone is really screwed up. But I hope y'all figure out what I'm trying to do or figure out what this strip is. The strip looks like it has a bridge rectifier on it but then again I don't know a whole lot about Electronics


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james_s:
You'll need to reverse engineer the circuit and draw a schematic to see what it is. It looks like you're going to need a constant current source though, ie a ballast. That doesn't necessarily mean a fluorescent lamp ballast but you will need something to provide a constant current with the ability to supply at least 80V. If you don't know much about electronics though I can't say I recommend this project, it involves voltages that could potentially cause injury or death, and a fault due to a poorly designed driver could start a fire. Don't take this the wrong way as I encourage learning but this is one of those things where if you have to ask, you maybe shouldn't be messing with it.
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