Why are lamps and lanterns getting lighter and lighter now, and the lifespan has not changed?

In the past, the lamps were very heavy, but the current lamps are not as heavy as before, and the temperature is getting higher and higher. Why is there such a change?

The high temperature resistance of the previous lamp beads is generally 80 to 100 degrees Celsius, and the current lamp beads can reach 100 to 120 degrees Celsius, and the heat dissipation components will also reduce the corresponding proportion

The voltage of the lamp beads is getting higher and higher, the components used are less and less, and the temperature generated will be reduced.

Now many lamps and lanterns are added with constant temperature IC. When the temperature reaches 80 or 85 degrees, the lamp will automatically reduce the power, thus protecting the lamp beads.