very basic question about power needed for light strip

[pfps823]

Hi,
New to forum and new to doing these types of projects so sorry if too basic a question for here, but I'm trying to find the right power supply to hook up to 2 light sockets, each powering a UV-C lightbulb. The bulbs are each 11 volts, 3.5 Watts and 300mA. I tried wiring to a 12 Volt supply I had lying around, but the bulbs are barely powering up. Is there a formula for figuring this out? And a source like Amazon for buying what i need?
Thanks!
Peter

 

[Les Jones]

What is the current rating of the power supply ? Have you measured the output voltage of the power supply when the bulbs are connected to it ? When you say that they are barely powering up how are you measuring the output as you can't see UV light ?

Les.

 

[KeepItSimpleStupid]

We need a lot more information, unfortunately.

This sounds like a UV LED based lamp. If it is, then a LED power supply that can handle 300 mA at a compliance voltage of 2*11 V should work. It would not be recomended running it off of a constant voltage power supply.

2 of these: https://www.amazon.com/Constant-Waterproof-Lighting-Transformer-Aluminium/dp/B01MYBFR7U, one per each LED

should work.

You have 300 mA and a compliance of 2-20V. Your compliance would have to be 22V for 2 LEDS in series.
11 is between 2 and 20V and this PS is 300 mA constant current. It would not be dimmable.

 

[pfps823]

Thanks for the feedback. I'm more clueless than I thought!

It's not an LED. Here's the link from Amazon: https://www.amazon.com/gp/product/B001TLRSOA/ref=ask_ql_qh_dp_hza

I can't find anything reasonably priced any more that's fully assembled, otherwise I'd just buy!

 

[KeepItSimpleStupid]

I can never believe Amazon. You shouldn't either.

Specs:

• 35 Watt bulb with the power of UV C UV C light fights germs, kills airborne bacteria, viruses and mold spores
• Germ Guardian LB1000 UV C Replacement Bulb is a 3
• Important information
  Legal Disclaimer
  Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
  
  Wattage
  3.5 Watts

if the picture is right, there is a filament. The resistance of a tungstein bulb is about 10x lower when cold. Your power supply needs to be able to provide that as a surge or be slow-start.

Call company, get specs if possible. P=VI, so 35=11(I); means 3.18 amps.
or 3.5/11 = 0.3A = 300 mA; You will need a >3.18 (~300 mA * 10) Amp power supply or a power supply with slow start forone bulb.

Aside:
I need a 4 Volt 2 Watt light bulb.
For What? (Watt)
No, two. (Watt)

 

[Les Jones]

I do not see how a filament can produce UV light. I think the filament part may be just for starting, None of the information I found gives the voltage rating of the lamp but it does warn that it contains mercury. I suspect the lamp needs a relatively high voltage and some form of ballast such as a choke to limit the current. I think the UV is produced by ionized mercury vapour.

Les.

 

[KeepItSimpleStupid]

interesting: https://donklipstein.com/uvbulb.html

 

[KeepItSimpleStupid]

This fits: https://www.1000bulbs.com/product/7339/GERM-3000022.html

So, looks like a low pressure mercury arc lamp.

 

[Pommie]

That's a germicidal light. It destroys bacteria by destroying the DNA in the cell. It will do the same to your retina and you'll go blind. Unless you are able to completely enclose it then you shouldn't use it. Note, when working you will see a faint purple glow.

What are you trying to do?

Mike.

 

[pfps823]

That's a germicidal light. It destroys bacteria by destroying the DNA in the cell. It will do the same to your retina and you'll go blind. Unless you are able to completely enclose it then you shouldn't use it. Note, when working you will see a faint purple glow.

What are you trying to do?

Mike.

Thanks. I'm using it to sterilize, and am aware I shouldn't look at it or have my skin exposed to it.

 

[pfps823]

I can never believe Amazon. You shouldn't either.

Specs:

• 35 Watt bulb with the power of UV C UV C light fights germs, kills airborne bacteria, viruses and mold spores
• Germ Guardian LB1000 UV C Replacement Bulb is a 3
• Important information
  Legal Disclaimer
  Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
  
  Wattage
  3.5 Watts

if the picture is right, there is a filament. The resistance of a tungstein bulb is about 10x lower when cold. Your power supply needs to be able to provide that as a surge or be slow-start.

Call company, get specs if possible. P=VI, so 35=11(I); means 3.18 amps.
or 3.5/11 = 0.3A = 300 mA; You will need a >3.18 (~300 mA * 10) Amp power supply or a power supply with slow start forone bulb.

Aside:
I need a 4 Volt 2 Watt light bulb.
For What? (Watt)
No, two. (Watt)

Thanks. So this should work?

Amazon.com: 12 Volt Power Supply - 3.5 Amp Standard (12V 3.5A DC) Adapter: Home Audio & Theater

Amazon.com: 12 Volt Power Supply - 3.5 Amp Standard (12V 3.5A DC) Adapter: Home Audio & Theater

www.amazon.com

 

[KeepItSimpleStupid]

Thanks. So this should work?

For one bulb, yes. For 2, maybe.

OCP means Over Current Protection. It probably means hiccup mode which means it continues to try to start when the current is exceeded.