Using these RGB as a base example
Basic Electronics Crash Course
- Volts * Amps = Watts
- Watts / Volt = Amps
General Information
These strips indeed usually come in lengths of 5 meters but you find suppliers that will give you 10/15/20 metres options also. Most only provide 5 meters because of the power they need to power up properly. So they try and sell you a cheap 12volt apadter used for each 5M strips but also the guys who sell them up to 20Metres does not mean you can use the entire length because the PCB traces might burn out caused by overloading them. You need to check with the seller how you can use them. The market is flooded with various makes and knock offs- so make sure you can get the specifications.
A lot of LED 5050 or 3258 each have different power ratings and usually come in 150 or 300 per 5 meters (30 / 60 per meter)
Powering LED strips
From the example provided earlier I will use single colour LED. The 5 meter white strip uses 24 Watts - That is 2A X 12 = 24WATTS - So using any 12v power supply with at least 2A will power that single 5 meter strip at 100%
I have similar strip and I joined them with a soldering iron to make a 10 meter strip and it works fine. I powered them up for 10 minutes and felt if the PCB tracks, close to the power supply because that is were the highest power draw will be, checked if they were getting warm/hot. They were cold so I left them for another 30 minutes and still cold, so they could handle the extra power. To calculate the MAX rating of the PCB track you would need to know the material, PCB thickness and width (Which nobody supplies). Also there is no equipment to test that either.
So instead of buying several small 12V adapters I go to the next best thing. A computer power supply!
![enter image description here](https://i.stack.imgur.com/PHoWT.jpg)
You can get really cheap ones like 450Watt and they can power up tens of strips with clean 12volt power, with short circuit protection and overload protection. This is a DIY Q&A so there needs to be DIY involved! Using a Computer PSU you are only interested in the yellow and black wires. The rest you can cut away/discard.
Here is a diagram showing the pinout computer PSU connectors.
![enter image description here](https://i.stack.imgur.com/1DmZI.png)
You need to realize you cannot just join all the yellows and use it as one. Each yellow wire is a PHASE and each phase has a maximum amperage rating. All the phases give the power supply its maximum peak rating.
![enter image description here](https://i.stack.imgur.com/QCern.jpg)
As long as the combined amperage/wattage does not exceed that written on the label of the PSU you will be OK to combine many LED strips to a single phase. But each 5 Meter LED strip will need to be powered individually to be safe. So you need to pull wire alongside all your led strips if you're going to go more than 10M :(
OK - Fine it seems too much faffing around with the computer PSU- but I would like you to know that paying extortionate prices for 12volt power adapters is not neccessary. LED's are not special- they do not need special 100pound adapters. Just shop around for big wattage 12volt supplies. You should find good prices.
Cutting LED strips
![enter image description here](https://i.stack.imgur.com/ZXh4K.jpg)
Joining LED strips
Picture worth a 1000 words
![enter image description here](https://i.stack.imgur.com/HixvG.jpg)
Just match up the pads, join them like that or use some cable. Does not matter.
RGB LED's and drivers
Unfortunately RGB LEDS use three 12volt channels with a controller that outputs a variation of voltages on each channel to get the LED to its desired colour. The controllers output a PWM signal and can only handle the maximum watts it is rated for. the only suggestion is to buy 4 of the exact same model that use infra-red remote. Put them side by side so that the remote will control all of them at the same time and pull your cables to the desired locations. Some of these controllers can store pre set colours so that could be an advantage.
But you can also buy a repeater now a days from China. They are basically another micro controller that sense the PWN signal and outputs the same but with the ability to power more strips.
![enter image description here](https://i.stack.imgur.com/FwNf4.jpg)
-EDIT Nov/2014
There are allot more RGB amplifiers / repeaters on the market now and cost between 5-15USD. Search on eBay for local seller.
Good Luck, it's not that bad :)
The eyeball or gimbal fixture has spring loaded clips. SHUT OFF POWER, take utility knife and score any paint that may have sealed the ring to ceiling, pull the ring from straight down, compress and release spring tension, pull assembly out of can. By holding the socket in one hand and twist bulb with other......yes/no...safety glasses, gloves, and a bag to put over bulb and assembly and break bulb.... sometimes you can just twist the bulb until it releases from its base, the socket will now be free from gimbal assembly, I use a pair of linemen plier to free the base from the socket...yes/no replace socket....MAKE SURE POWER IS OFF FIRST
Best Answer
That's crazy, there's another thread using the word "driver" to talk about a constant-voltage LED power supply, and now this thread using the word "power supply" to talk about a constant-current driver. Marketing is funny lol.
The sticker on the LED cover is mistaken. The driver labeling contradicts it, and the driver is far more likely to be correct, since the lamp did work.
The ruling figure on this driver is
SEC: Constant current: DC540ma
. This is a 540 milliamp driver designed to output exactly that current (at whichever voltage that happens at). This voltage is decided by the LED characteristics.However, the driver is not magical; and is only electrically tuned for an output in a certain voltage range. That is specified next: 30-56 volts, with 60V an absolute max. Further, it has a maximum power output of 31 watts, which jibes with the 56 volts.
LEDs work at best performance when driven at constant-current. They are not ohmic, and cannot "work as their own resistors" the way an incandescent bulb can. (that was the hardest part about designing incandescent bulbs; Edison had no access to constant-current power supplies (though Tesla did, because of AC).
So, the replacement driver you need has
Noting that your driver module has a "TUV" logo, that means whoever built this lamp actually complied with quality standards and used a driver approved by an NRTL (Nationally Recognized Testing Lab) - a list maintained by USA's OSHA, but that is considered the gold standard worldwide for reliable suppliers. The "CE" logo is not enough.
I would shop for drivers at mouser.com, Digi-Key, etc. Avoid at all costs the cheap Cheese junkstream coming out of Shenzhen.