Simple

Simple bulbs are the traditional and most economical options for car lighting. They produce sufficient brightness for everyday driving, although they do not offer the same intensity or lifespan as other modern technologies, such as LED or Xenon.

H4

It is a type of bulb used for front headlights.

Indicates the power consumption of the lamp and is related to its brightness. It should always comply with the vehicle manufacturer's specifications to avoid overloading or malfunctions in the electrical system.

Colour temperature in lamps refers to how warm or cool the color is. 

The warmth of light is measured in Kelvin; the lower the Kelvin rating, the more reddish the hues, and the higher the rating, the bluer the hues.

Indicatively, lights with 3000 Kelvin are usually recommended for fog lights, lights with 4300-5000 Kelvin are usually recommended for driving lights, and from 6000 Kelvin and above are for a more distinctive style.

Voltage indicates the electrical current required for a lamp to function properly. Most car lamps operate at 12V, which is the standard voltage for most passenger vehicles. In trucks or heavy vehicles, 24V lamps are usually used.