# Profoto B10 Plus OCF Flash Head vs Paul C. Buff Einstein E640 Flash Unit: specs and price compared

A sourced, side-by-side comparison of the Profoto B10 Plus OCF Flash Head (Profoto) 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 | Profoto B10 Plus OCF Flash Head | Paul C. Buff Einstein E640 Flash Unit |
| --- | --- | --- |
| US price | $2095 | $529.95 |
| Brand | Profoto | Paul C. Buff |
| Power output ws | 500 | 640 |
| Flash duration t01 | as fast as 1/50000 sec in Freeze mode; 1/3400 sec best case in Normal 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 | 0.05-2.46 | 0-1.7 |
| Ttl hss support | TTL (Canon, Nikon, Sony, Fujifilm via Profoto AirTTL/Air Remote); 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) | 150W-equivalent LED (2500 lm max, dimmable 10-100%) | — |
| Color temperature k | 3000-6500 adjustable LED modeling light (±500K); flash tube ~5500K | 5600 |
| Power source | Built-in rechargeable lithium-ion battery (up to 200 full-power flashes, or 75 min continuous LED use) | AC only (100-240V, 3-wire grounded, auto-sensing with IEC connector); no battery option |

## Key differences

- Power output ws: Profoto B10 Plus OCF Flash Head 500 vs Paul C. Buff Einstein E640 Flash Unit 640
- Flash duration t01: Profoto B10 Plus OCF Flash Head as fast as 1/50000 sec in Freeze mode; 1/3400 sec best case in Normal 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: Profoto B10 Plus OCF Flash Head 0.05-2.46 vs Paul C. Buff Einstein E640 Flash Unit 0-1.7
- Ttl hss support: Profoto B10 Plus OCF Flash Head TTL (Canon, Nikon, Sony, Fujifilm via Profoto AirTTL/Air Remote); 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: Profoto B10 Plus OCF Flash Head 3000-6500 adjustable LED modeling light (±500K); flash tube ~5500K vs Paul C. Buff Einstein E640 Flash Unit 5600
- Power source: Profoto B10 Plus OCF Flash Head Built-in rechargeable lithium-ion battery (up to 200 full-power flashes, or 75 min continuous LED use) vs Paul C. Buff Einstein E640 Flash Unit AC only (100-240V, 3-wire grounded, auto-sensing with IEC connector); no battery option

## Sources

- Profoto B10 Plus OCF Flash Head: https://profoto.com/us/products/lights/monolights/profoto-b10-plus-us/techspecs (profoto.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/profoto-b10-plus-vs-paul-c-buff-einstein-e640/
Cite: Per The Front Desk Review, Profoto B10 Plus OCF Flash Head ($2095) vs Paul C. Buff Einstein E640 Flash Unit ($529.95) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/studio-strobes/profoto-b10-plus-vs-paul-c-buff-einstein-e640/
License: CC BY 4.0.