A couple years ago, I bought a string of led festoon lamps. This was a cheap purchase from a Chinese seller on Amazon, who is no longer actively trading. The strings came with a couple spare lamps, but now they have all been used up and I need to find some new ones. The issue is that the packaging has no indication of their spec, and the lamps themselves have no markings on them, so this is quite tricky.
I tried getting these. They fit in the socket, so thats a good start, but they don't light up.
Before I go out searching for something again, can someone help me figure out if it's a lost cause and I should just buy a new string or if it is possible to work out what type of lamp I require. The picture is of the plug/transformer. It's the only info I have to go off...
3 Comments
swicano@programming.dev · 6 pts · 1d
That's a DC converter. It says on it eingang (input) 220-240V~ 50-60hz 0.3A. That means it accepts AC power (from the squiggle after the V) of 220-240 Volts, alternating at a frequency between 50-60hz. That range means it covers most countries, but to me the 220-240V says it won't work in my house (the US is 120V, mostly). You can also do that math and find that yours can take as input up to 240V*0.3A = 60 VA (which isn't quite Watts, but kinda).
The other thing it says is Ausgang (output) Urated*and Uout with 24/26 V and then a solid line over a dashed line. That means DC voltage, so it doesn't need a Hz number. It also says 9W (watts), we can again do the math of I V = P -> I A * 24 V= 9 W, or about 2.5ish Amps. So you just need to know that the input (220V 60Hz) covers what your wall puts out, while 24V and less than 2.5 amps (or less than 9W) is what your bulb has to consume.
Generally speaking, if the voltage is over 100 its probably AC, and if it's under 50 it's DC, but always look for the little AC squiggle or DC line-with-dashed-line-underneath. The rest of the text all means stuff, and one of those looks like it might be the base shape like the other commenter said, but a lot of it is just various certifications that aren't super important to you and I
jane232@discuss.tchncs.de · 3 pts · 1d
Your power suppy suppies 24V, so you need bulbs with 24v. The ones you bought are for 220V. As you wrote, they do actually fit in the socket, so you need an 24V E12 bulb.
Something like this
Your power supply also only provides 9W so it would only be able to power up to 9 of these 1W bulbs from the link.
anytimesoon@piefed.social · 3 pts · 1d
Ah of course... 24v out. OK that makes sense.
There are 30 lamps per string, so they should be about .3W each?