# Paul C. Buff Einstein E640 Flash Unit vs Interfit Honey Badger 320Ws Compact Flash Head: specs and price compared

A sourced, side-by-side comparison of the Paul C. Buff Einstein E640 Flash Unit (Paul C. Buff) and Interfit Honey Badger 320Ws Compact Flash Head (Interfit) among studio strobes.

## Side by side

| Spec | Paul C. Buff Einstein E640 Flash Unit | Interfit Honey Badger 320Ws Compact Flash Head |
| --- | --- | --- |
| US price | $529.95 | not published |
| Brand | Paul C. Buff | Interfit |
| Power output ws | 640 | 320 |
| Flash duration t01 | 1/568 sec at full power (Constant Color mode, t0.5 1/1600 sec); as fast as ~1/2000 sec (t0.1) at half power in Action Mode | 1/900 sec at full power |
| Recycle time s | 0-1.7 | 1 |
| Ttl hss support | Manual only — no TTL, no camera-side HSS. Fires via CyberSync radio triggers or optical slave; Action Mode shortens flash duration for motion-freezing rather than providing sync-pulse HSS. | Manual only — no TTL, no HSS documented in the manufacturer manual (fires via built-in optical slave or 2.4G radio trigger accessories) |
| Modeling lamp (W) | — | 60 |
| Color temperature k | 5600 | 5600 |
| Power source | AC only (100-240V, 3-wire grounded, auto-sensing with IEC connector); no battery option | AC power port (no battery option); optional external battery packs sold separately by Interfit |

## Key differences

- Power output ws: Paul C. Buff Einstein E640 Flash Unit 640 vs Interfit Honey Badger 320Ws Compact Flash Head 320
- Flash duration t01: Paul C. Buff Einstein E640 Flash Unit 1/568 sec at full power (Constant Color mode, t0.5 1/1600 sec); as fast as ~1/2000 sec (t0.1) at half power in Action Mode vs Interfit Honey Badger 320Ws Compact Flash Head 1/900 sec at full power
- Recycle time s: Paul C. Buff Einstein E640 Flash Unit 0-1.7 vs Interfit Honey Badger 320Ws Compact Flash Head 1
- Ttl hss support: Paul C. Buff Einstein E640 Flash Unit Manual only — no TTL, no camera-side HSS. Fires via CyberSync radio triggers or optical slave; Action Mode shortens flash duration for motion-freezing rather than providing sync-pulse HSS. vs Interfit Honey Badger 320Ws Compact Flash Head Manual only — no TTL, no HSS documented in the manufacturer manual (fires via built-in optical slave or 2.4G radio trigger accessories)
- Power source: Paul C. Buff Einstein E640 Flash Unit AC only (100-240V, 3-wire grounded, auto-sensing with IEC connector); no battery option vs Interfit Honey Badger 320Ws Compact Flash Head AC power port (no battery option); optional external battery packs sold separately by Interfit

## Sources

- Paul C. Buff Einstein E640 Flash Unit: http://s196259524.onlinehome.us/e640.php (s196259524.onlinehome.us, verified 2026-08-09)
- Interfit Honey Badger 320Ws Compact Flash Head: https://interfitphoto.com/products/honey-badger-320ws-compact-flash-head (interfitphoto.com, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/studio-strobes/paul-c-buff-einstein-e640-vs-interfit-honey-badger-320/
Cite: Per The Front Desk Review, Paul C. Buff Einstein E640 Flash Unit ($529.95) vs Interfit Honey Badger 320Ws Compact Flash Head (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/studio-strobes/paul-c-buff-einstein-e640-vs-interfit-honey-badger-320/
License: CC BY 4.0.