What's the difference between expensive and cheap photographic lamps?

In fact, if you shoot goods, you can choose according to the products you shoot now and the products you shoot abroad. Generally, if you are shooting portraits or some luggage products, the flash of about 500W is generally tough and cheap. If you call back, the call back time of the full-power 500W lamp is 1.8 seconds, which is unnecessary. If you are shooting a commercial advertisement, you may need to buy an expensive callback with a more accurate color temperature.