Joke Collection Website - Talk about mood - What does the letter in front of the Led lamp bead model mean?

What does the letter in front of the Led lamp bead model mean?

Led floodlight, led floodlight, LED floodlight ceiling lamp, LED floor lamp, LED underground lamp, LED underground lamp projection lamp, LED spotlight bulb, LED bubble lamp track lamp, LED track lamp bean bile lamp, LED downlight lamp cup, LED lamp cup wall lamp.