LED lights 90v DC

Does anyone know where I can get ES LED bulbs that run on 90v DC?
I have some that run on 100v DC. I don't know how they run but they do!

geek_trade4us2, Mar 15, 5:03 pm

You can run LEDs at any DC voltage with the addition of a suitable series resistor

geek_andrew1954, Mar 15, 5:11 pm

The bulbs say 100v to 250v. They do not say AC or DC.
The wiring cannot be changed to add resistors.

geek_trade4us2, Mar 15, 5:22 pm

Is there a symbol by the voltage like this ~ ? It may run on 90V DC. Have you tried one?. What do you have that has 90vdc?

geek_macman26, Mar 15, 8:02 pm

I have about 560 volts DC and have 6 bulbs in series.

No there is no symbol.
Yes the bulb works on 100 volts DC but not less.

geek_trade4us2, Mar 15, 8:07 pm

geek_rojill, Mar 15, 8:40 pm



Probably not a good idea running this way as every light would have to be identical or you get volt drop issues.
Now that said. Can you not just run 2 strings of 3 or 4 and parallel the 2 up. That would give about 140-190v per lamp providing current draw is identical for each lamp. Where are you getting the high volt dc from?

geek_macman26, Mar 15, 10:59 pm



Power supply
https://trademe.tmcdn.co.nz/photoserver/full/370060214.jpg

Can't do any rewiring. Need to be able to put 110v incandescents in sometimes.

geek_trade4us2, Mar 15, 11:26 pm

How have worked out the supply voltage is 90v DC?

geek_sprinter51, Mar 15, 11:35 pm


I have about 560 volts DC and have 6 bulbs in series.
Obviously I don't want the bulbs to go out with slight fluctuations in voltage.

geek_trade4us2, Mar 16, 12:02 am

I can see the problem :-)
I don't see an easy way out for this
The chances of get 90v Leds are remote to say the least

geek_sprinter51, Mar 16, 12:23 am

A place you may wish to call Monday is
http://lampspecialists.co.nz/

geek_sprinter51, Mar 16, 12:26 am



Probably have to make your own, I'd get some filament led style ES bulbs, they usually just have a capacitive dropper in and there are quite a number of LED die in series, modify the circuit appropriately for 90vDC by using a suitable series resistor instead of the series capacitor.

bigclivedotcom has a number of teardowns and diy filament bulb stuff
https://www.youtube.com/results?search_query=bigclivedotcom+filament

geek_bitsy_boffin, Mar 16, 1:07 am

PS: Nice rectifier(s), where'd you find those!

geek_bitsy_boffin, Mar 16, 1:13 am



I know where there are some going cheap! But no contractor will agree to move them.

Yes, I will think about making suitable LED lamps. Why didn't I think of that?

geek_trade4us2, May 18, 9:09 am

Share this thread