Hi, do you know clearly what’s difference between 194 vs 921 bulb?

If not, I would like to explain to you 194 vs 921 bulb as below.

194 bulb is t10 and 921 bulb is t15.

We can see their difference easily by our eyes.

Because 194 bulb is small and 921 bulb is litter bit bigger.

The diameter of 194 is about 10mm and 921 bulb is 15mm.

In my factory, 194 and 921 bulb can be made of by tungsten filament or led.

I will show you some pictures of 194 and 921 bulb as below.

Welcome all customers come to talk with us 194 vs 921 bulb at any time.