Question

What is the technical name for a light intensity meter?

Answer 1

Light Intensity Meter - it doesn't have any particular "special" name.

Explanation:

You may be confused with some brand names or descriptions that may include the particular dimensions/units used in a meter, such as LUX, candela, exposure, lumens, watts, radiometer or Candlepower.

Light Meters

Light meters are easy-to-use, high performance instruments perfect for use as photometers (lux meters), intensity meters (candela), curing meters (dose and exposure meters), power meters (watts or lumens), and flash meters (Xenon or LED strobe lamps).
https://www.intl-lighttech.com/product-group/light-meters