3528 vs 5050 SMDs | All you need to know

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The LED is a smaller SMD chip than those used on the LED strip SMD, its dimensions are 3.5mm x 2.8mm. The LED chip is mostly used in a LED tape of 60 LEDs per metre pulling 4.8w and at 12v (commonly known as 4.8w p/m or 5w p/m LED tape). At this quantity per metre of this SMD you will get a smooth, bright effect once shined onto a surface  with a lumen output of around 330-360 lumens per metre (halogen 40w equivalent) depending on the colour. The colours available in the SMD are warm and cool white (all different Kelvins requirements can be made), red, green, blue, and amber.  The most common type of applications for the 60 LED SMD LED tape is as feature lighting &#; such as plinth lighting, cove lighting, in homes, bars, restaurants and hotels etc.

Another LED tape using the SMD is the LED tape with 120 of these LEDs per metre pulling 9.6w (commonly known as 9.6w p/m or 10w p/m LED tape). It is available in the same colours although this is nowhere near as popular as the &#;standard&#; 60 LED per metre type LED tape. The output would be exactly double as it is using double the amount of LEDs so around 660-720 lumens per metre depending on the colour. The applications for this LED tape would still be feature lighting but where there is more ambient light so a higher power than the 4.8w p/m is required.

Both of these LED tapes are available in an IP67 version. The cut points for the LED tapes would be 50mm for the 60 LED per metre type and 25mm for the 120 LED per metre type.

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Used at either 60 or 120 LEDs per metre, SMDs  do not give off a lot of heat (you can easily touch them with your hands). They require a minimum of an 8mm-wide PCB board, and for the 120 LEDs per metre version a 2-ounce thick PCB board. As long as the LED tape you&#;re using meets these specs, you can simply fit it anywhere as it will already have enough of a heat sink not to require an aluminium extrusion.

There are many brands of the SMDs. The high-quality branded Epistar SMD will give you the highest bright SMD&#;s on the market, as well as excellent colour consistency and reliability with 70% output at 50,000 hours. If you choose one of the cheaper alternatives you will get less brightness, as well as unreliability and colour inconsistencies within the reel and also between reels.

I believe dimension wise they are the same correct?  is it just the efficiency that separates them?  Reason I ask is i have an LED light fixture that I want to swap the lights out for a cool white led.  I checked my my adjustable power supply and at 20mA it is around 8.2V which confuses me.  If it has multiple LEDS on one chip would it still only have 2 solder pads?  Is there any way to visually ID one that has multiple LEDS on the chip?  If it was 3 LEDS that means that each had an average Vf of 2.73V which seams low and if two, 4.1V sounds high.  Any input would be appreciated.  I always seem to get stumped by these things.  This particular light has 15 of these in series and has 120Vac rectified and 110Vdc is coming out to an 8 pin chip which I think is a constant current drive but the numbers don't come back to anything.  here is also an N channel mosfet in there.

Sorry for the basic question here.

Dave

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