5V USB LED Light Bulb  Daylight White £1 at poundland very bright
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5V USB LED Light Bulb Daylight White £1 at poundland very bright

13
Found 23rd Nov 2015
These seem to new in poundland , pretty good usb light with cable about 1 meter long. In 3 colours red,blue and yellow all with white daylight bulb.

Very bright 5w led bulb , had a few of these from Amazon for summer camping and are very good when used with a phone powerbank. Also got a few over my fish tank connected to normal usb phone charger. Their just a bit smaller than the standard light bulb.
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wouldn't that mean that it would draw 1amp, other than proper USB mains chargers wouldn't that exceed regular USB spec?...
if its really as claimed, then its a great deal...
Original Poster
polarbaba

wouldn't that mean that it would draw 1amp, other than proper USB mains … wouldn't that mean that it would draw 1amp, other than proper USB mains chargers wouldn't that exceed regular USB spec?... if its really as claimed, then its a great deal...



on the computer and with a charger mine draws .45 amps ,just checked with one of those usb current meters,very handy little devices.
bigjeremy

on the computer and with a charger mine draws .45 amps ,just checked … on the computer and with a charger mine draws .45 amps ,just checked with one of those usb current meters,very handy little devices.


Very handy little devices, if they are accurate...!
This cannot draw 5w, at 5v... if it did, then as queried above, it would draw 1amp, standard usb spec is 500ma, apart from specific charging sockets...
At 5v (usb voltage) .45aph would only be ~2.4 watts.
Original Poster
bilbob

Very handy little devices, if they are accurate...!This cannot draw 5w, … Very handy little devices, if they are accurate...!This cannot draw 5w, at 5v... if it did, then as queried above, it would draw 1amp, standard usb spec is 500ma, apart from specific charging sockets... At 5v (usb voltage) .45aph would only be ~2.4 watts.



On my usb power bank they draw about 0.6w each guess that makes them at least 3 watts.
Maybe if this was USB 3.0 then you might get almost the stated 5w, as you can draw 900ma, but USB, 2.5w Max.
Unless you are a conspiracy theorist, why be fussed abut how much current it takes unless there is likely to be a detrimental effect on the power source or other USB devices using the same source? If those two items don't form an issue, the real q is: is the amount of light being produced suitable for the application? For a quid, I wouldn't expect end-of-world disappointment if it was too bright / too dim.
Are these dimmable using software on PC (when plugged into PC USB socket)?
AndyRoyd

Unless you are a conspiracy theorist, why be fussed abut how much current … Unless you are a conspiracy theorist, why be fussed abut how much current it takes unless there is likely to be a detrimental effect on the power source or other USB devices using the same source? If those two items don't form an issue, the real q is: is the amount of light being produced suitable for the application? For a quid, I wouldn't expect end-of-world disappointment if it was too bright / too dim.


Because current draw of the light source is directly related to the light output. If it says it draws 5w, then it should output a certain amount of light, but it can't be drawing 5w from a USB port is the point... Not a standard USB2 port anyway... and another post indicates it draws nearly half of 5w anyway...
bilbob

Because current draw of the light source is directly related to the light … Because current draw of the light source is directly related to the light output. If it says it draws 5w, then it should output a certain amount of light, but it can't be drawing 5w from a USB port is the point... Not a standard USB2 port anyway... and another post indicates it draws nearly half of 5w anyway...



Agreed. Power (wattage) = current x voltage. Since USB ports output a maximum of 500mA, the highest power possible at 5V will be 2.5W. You can't cheat physics.

Now will someone tell me if these are dimmable?
Edited by: "j2theg" 24th Nov 2015
Just bought one now and I'm pretty impressed with the light output. Inside are 10 surface mount LEDs each with an 18 ohm resistor sucking down a volt. Voltage across each led was 3.05 volts. I had to get someone else to take the reading because they'd knocked my irises down to the level where I couldn't read the LCD.

Not software dimmable as there are no electronics inside, just the +ve and -ve running to the middle. I've been repurposing old mobile phone batteries all day and soldering connectors onto them to power LED camping lights and various other junk. I'll see how this does with one and use it as a light under the stairs if it's working well. Might also short out all the resistors if I need to as it would only be on for about 10 seconds at a time.

As Big Clive would say "Yeeahhhhs, it's a nice wee thing."

EDIT: Runs well on a 3.7 volt phone battery. Plenty bright enough for under the stairs/coal hole/granny cubby.

These are the same bulbs
youtube.com/watch?v=DXOYq1UpNAw
youtube.com/wat…hAo
Original Poster
Duelling Duck

Just bought one now and I'm pretty impressed with the light output. … Just bought one now and I'm pretty impressed with the light output. Inside are 10 surface mount LEDs each with an 18 ohm resistor sucking down a volt. Voltage across each led was 3.05 volts. I had to get someone else to take the reading because they'd knocked my irises down to the level where I couldn't read the LCD.Not software dimmable as there are no electronics inside, just the +ve and -ve running to the middle. I've been repurposing old mobile phone batteries all day and soldering connectors onto them to power LED camping lights and various other junk. I'll see how this does with one and use it as a light under the stairs if it's working well. Might also short out all the resistors if I need to as it would only be on for about 10 seconds at a time.As Big Clive would say "Yeeahhhhs, it's a nice wee thing."



You can also get some with a usb plug on the bulb from ebay.com for $.99, I use them on those cheap battery boxes as got lots of old laptop batteries.Had a power cut last night so got a good usage of them.

ebay.com/itm…521
The ones without cable only have one led inside and run at .5w instead of the 5w promised
Original Poster
Roughsleeper

The ones without cable only have one led inside and run at .5w instead of … The ones without cable only have one led inside and run at .5w instead of the 5w promised


Ok thanks mine havent turned up yet was advertised as 5w!
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