I am using 1210 smd led for lamp. I am little confuse about the footprint about LED. In the kicad footprint looks different and in the actual package looks different.
In the kicad i can see following footprint for the led
5 Values* 20pcs=100PCS Bright 3528 1210 SMD LED Kit Red/Green/Blue/Yellow/White 20pcs Each LED Diode 22.214.171.124mm
And without a real datasheet, that’s all you can look at.
The Footprint name text is also not fully visible in your screenshot. I assume it is:
That footprint is made for a LED which is 3.2mm long and 2.5mm wide (The 3225Metric text), while the Ali LEDS are 3.5 * 2.8mm. So the footprint you selected is a bit too small for these LED’s.
I had a look at other available footprints in KiCad’s default LED_SMT library, and none seem to fit these Ali LED’s. So you can either select a different size of LED, or do as BobZ recommends and make your own Footprint, or modify an existing one. Having the Pads a big on the largish side is also indeed easier for hand soldering (which is why the “Handsoldering” footprints have big pads).
I have never bought from Ali Express; I cannot find a datasheet. Metric 3528 sounds a little large for 1210 size. Is it too late to change your pcb footprint?
Your 3d drawing…is that the maximum component size placed over the KiCad pad layout?
I like to use oversize/fatter pads which could fit parts which are somewhat larger or smaller. This works well for limited hand assembly; I suspect that you are not building 1000’s if you are buying 20 from Ali Express. It is easy to make your own footprints and I recommend that you give it a try.
I agree about the markings on SMT LEDs. Manufacturers tend to mark the bottom. But…I have an ON Semi 6 pin SC-70 NL7SZ97 logic gate on which (for the life of me) I cannot see the dot for pin 1. Fortunately I was able to barely make out which way the other marks were upright.