# Godox AD600Pro 600Ws TTL Outdoor Flash vs Paul C. Buff Einstein E640 Flash Unit: specs and price compared

A sourced, side-by-side comparison of the Godox AD600Pro 600Ws TTL Outdoor Flash (Godox) and Paul C. Buff Einstein E640 Flash Unit (Paul C. Buff) among studio strobes. Paul C. Buff Einstein E640 Flash Unit is the cheaper of the two at $529.95.

## Side by side

| Spec | Godox AD600Pro 600Ws TTL Outdoor Flash | Paul C. Buff Einstein E640 Flash Unit |
| --- | --- | --- |
| US price | $899 | $529.95 |
| Brand | Godox | Paul C. Buff |
| Power output ws | 600 | 640 |
| Flash duration t01 | 1/220 to 1/11760 sec (up to ~1/20000 sec in Freeze/Multi-Freeze mode) | 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 |
| Recycle time s | 0.01-0.9 | 0-1.7 |
| Ttl hss support | TTL (Canon E-TTL II, Nikon i-TTL, Sony, Fujifilm, Olympus, Panasonic); HSS to 1/8000s | 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. |
| Modeling lamp (W) | 38 | — |
| Color temperature k | 4800 | 5600 |
| Power source | Removable 28.8V/2600mAh lithium-ion battery (up to 360 full-power flashes); optional AC adapter | AC only (100-240V, 3-wire grounded, auto-sensing with IEC connector); no battery option |

## Key differences

- Power output ws: Godox AD600Pro 600Ws TTL Outdoor Flash 600 vs Paul C. Buff Einstein E640 Flash Unit 640
- Flash duration t01: Godox AD600Pro 600Ws TTL Outdoor Flash 1/220 to 1/11760 sec (up to ~1/20000 sec in Freeze/Multi-Freeze mode) vs 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
- Recycle time s: Godox AD600Pro 600Ws TTL Outdoor Flash 0.01-0.9 vs Paul C. Buff Einstein E640 Flash Unit 0-1.7
- Ttl hss support: Godox AD600Pro 600Ws TTL Outdoor Flash TTL (Canon E-TTL II, Nikon i-TTL, Sony, Fujifilm, Olympus, Panasonic); HSS to 1/8000s vs 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.
- Color temperature k: Godox AD600Pro 600Ws TTL Outdoor Flash 4800 vs Paul C. Buff Einstein E640 Flash Unit 5600
- Power source: Godox AD600Pro 600Ws TTL Outdoor Flash Removable 28.8V/2600mAh lithium-ion battery (up to 360 full-power flashes); optional AC adapter vs Paul C. Buff Einstein E640 Flash Unit AC only (100-240V, 3-wire grounded, auto-sensing with IEC connector); no battery option

## Sources

- Godox AD600Pro 600Ws TTL Outdoor Flash: https://www.godox.com/product-d/AD600Pro.html (godox.com, verified 2026-08-09)
- Paul C. Buff Einstein E640 Flash Unit: http://s196259524.onlinehome.us/e640.php (s196259524.onlinehome.us, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/studio-strobes/godox-ad600pro-vs-paul-c-buff-einstein-e640/
Cite: Per The Front Desk Review, Godox AD600Pro 600Ws TTL Outdoor Flash ($899) vs Paul C. Buff Einstein E640 Flash Unit ($529.95) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/studio-strobes/godox-ad600pro-vs-paul-c-buff-einstein-e640/
License: CC BY 4.0.