A big factor is the type of modifier used with the strobe. For example, at one extreme, there are 'sports' reflectors available from some brands that throw a narrow, highly concentrated beam of light compared to the much wider spread of standard reflectors. With those you can get away with lower power output. But they are hard light sources. If you want broad, soft light quality, you will need more power from a strobe (than if using highly focused reflectors) if shooting in direct midday sunlight using HSS. BTW, going from 400Ws to 600 only gains half a stop.
What did you rent previously and was it just enough power, or more than enough? This should give you some idea whether or not you can get by with 400Ws.
Mar 28, 2023 at 09:47 PM
Previous versions of rscheffler's message #16205511 « Is 400w enough for outdoor action? »
