Raya SDR-400 Alpha Monolight

BH #RASDR400 • MFR #SDR-400
Raya SDR-400 Alpha Monolight
Key Features
  • 400Ws Output
  • 6-Stop Power Range
  • 0.2 to 2.2 sec Recycling
  • 150W Halogen Modeling Lamp
With 400Ws of power backed with solid control and convenience features such as wireless triggering, the SDR-400 Alpha Monolight from Raya is a wise choice for studio and location photographers alike.
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Raya SDR-400 Overview

  • 1Description
  • 2Precision Light Adjustments
  • 3Wireless Triggering
  • 4Proportional and Independent Modeling Lamp Control
  • 5Built-In IR Slave and Pre-Flash Modes
  • 6Soft Start Circuitry (SSC)
  • 7User-Replaceable Bulbs and Fuses
  • 8Sleek, Durable, and Easily Transported

With 400Ws of power backed with solid control and convenience features such as wireless triggering, the SDR-400 Alpha Monolight from Raya is a wise choice for studio and location photographers alike.

The SDR-400's power is variable from 1/32 to full in 1/10 stop increments over a 6-stop range. The 150W modeling light can be set to proportional to visually match the selected power level for easy pre-visualization of your photo. The modeling light can be turned off completely or set to Independent to input any user-selected light level. The lamp can also be set to dim upon triggering and power up when the flash head is fully recycled.

Recycling time is a fast 0.2-2.2 sec @ 120 VAC and faster at 220-240 VAC with an action-stopping flash duration of 1/1000 sec and a color temperature of 5600K that varies only ±100K regardless of power settings. The SDR-400 has multiple triggering options including a traditional sync cord and an optical slave but it also has a built-in radio receiver that can be triggered at distances up to 65' by the included 4-Channel transmitter. Settings include sync delay, red-eye reduction and synchronous triggering.

Other features include fan-cooling using auto temperature control to lengthen the life of the flash tube and modeling lamp and protect the unit's electronics, as well as fused circuit protection. The rubberized high strength polymer housing has a S-type mount to take advantage of the wide range if accessories made available by Raya, Impact and other brands that use this mount. The SDR-400 comes with a 7" umbrella/grid reflector, power cord, sync cord, protective cap, 115V modeling lamp and user-replaceable flash tube. Swap the modeling lamp out for a 220V type when used overseas.

Precision Light Adjustments

The SDR-400 monolight's flashtube has a 6-stop power range, represented by a 10-60 numbered scale on the LED screen. You can subtly increase the power of the light in 0.1 increments with a push of a button

Wireless Triggering

The SDR-400 has an integrated 4-channel wireless receiver. Using the included transmitter, you can wirelessly trigger your flash unit from up to 65' away. Line-of-sight positioning is not required for your monolight to communicate with the transmitter

Proportional and Independent Modeling Lamp Control

This flash unit has a 150W, 2-mode, user-replaceable modeling light. Proportional mode keeps the bulb's power output proportional to the flashtube's power level. Independent mode allows you to set your own custom modeling light output level

Built-In IR Slave and Pre-Flash Modes

The Raya SDR-400 Alpha Monolight has five slave settings, ranging from an optical slave mode to modes that will trigger the unit with external flashes with up to three pre-flashes. Select your desired mode with the clearly marked digital control panel

Soft Start Circuitry (SSC)

The built-in Soft Start Circuitry (SSC) ensures longer modeling lamp life. When the modeling lamp is turned on, it will light up at the minimum brightness and gradually climb to the full power output

User-Replaceable Bulbs and Fuses

Both the flashtube and modeling light of the SDR-400 are user-replaceable. Additionally, the fuse compartment is removable for easy fuse replacement

Sleek, Durable, and Easily Transported

Built with high-quality rubberized polymer, the durable SDR-400 is lightweight and compact, making it easy to transport. A protective cap is provided for the flash tube and modeling lamp
UPC: 847628581623

Raya SDR-400 Specs

Flash Head
Maximum Power400 Ws
Power Control6 Stops in 1/10-Stop Increments
Guide Number165' / 50.3 m at 10' / 3 m, ISO100
Flash Duration1/1000 Sec (Full Power)
Recycle Time0.2 to 2.2 Sec
Color Temperature5600K ± 100K
Flash Ready IndicatorAudio, Visual
Reflector7" / Changeable
Accessory Fitting TypeBowens S Type
Modeling Light
Base TypeE26/E27
Wattage150 W
Control ModesIndependent, Off, Proportional
Sync TypeOptical, Radio
Built-In Wireless ReceiverYes
Wireless Channels / Groups4 / X
Wireless Range65' / 19.8 m (Radio)
Interface3.5 mm PC Sync
Sync Voltage5 V
AC Input Power100 to 240 VAC, 50 / 60 Hz
Circuit ProtectionFuse, Soft Start Circuitry, Thermal Control
Fuse10 A
Mount5/8" / 16 mm Receptacle
Auto DumpYes
Fan CooledYes
DimensionsH: 8.0 x W: 5.0 x L: 13.0" / H: 20.3 x W: 12.7 x L: 33.0 cm
Weight4.2 lb / 1.9 kg
Packaging Info
Package Weight6.7 lb
Box Dimensions (LxWxH)15.8 x 10 x 8.6"
See any errors on this page? Let us know


What speed ring works best with the raya strobe? ...

What speed ring works best with the raya strobe? Thanks, Mark
Asked by: Mark
The SDR-400 Alpha Monolight is designed to accept a Bowens S-Type mount speed Ring. Please check out the Impact Speed Ring. https://www.bhphotovideo.com/c/product/1342075-REG/impact_sr_impv2_speed_ring_for_impact.html/pageID/accessory
Answered by: Gradus Support
Date published: 2019-07-07

What remote would suggest for this model?

What remote would suggest for this model?
Asked by: Randy
The Raya SDR-400 Alpha Monolight includes a built-in receiver and a radio transmitter. In addition there is a 1/8” sync port which will allow you to use remotes from Impact, Vello, and others.
Answered by: Gradus Support
Date published: 2019-06-04

Voltage-220v input is available for this?

Voltage-220v input is available for this?
Asked by: Juhne
This monolight can be used within 100 to 240 VAC, 50 / 60 Hz. The modeling lamp must be changed for the Raya Modeling Lamp for Raya SDR-400 Alpha Monolight (150W/240V) B&H # RASDR150X. https://bhpho.to/2BWiTzk
Answered by: Kirk
Date published: 2019-05-02

Can this be synced with multiple SDR-400 strobes?

Can this be synced with multiple SDR-400 strobes?
Asked by: Andrew
Yes, Multiple SDR-400 Alpha Monolight units can be triggered simultaneously using the transmitter included with the unit.
Answered by: Gradus Support
Date published: 2019-06-21


Is there barndoors for this product? or What size is this?
Asked by: KeunHee K.
Since this monolight uses a Bowens S type mount, the Savage 4-Way Barndoor Set for LED Video Light Plus B&H # SABBD can work with it.
Answered by: Kirk R.
Date published: 2018-08-25


Can I use the Raya SDR-400 Alpha Monolight on a sony A7R II? Will it also be compatible with Sony Wireless Radio flashes? I'm switching from Canon to Sony... Thx.
Asked by: Alberto
Any camera with a hot shoe or a flash cable connection will work with the Alpha trigger...they also can be set in slave mode so any flash from any source will trigger them. Basically, whatever situation you create with your new Sony system will work fine with the Raya strobes.
Answered by: Anonymous
Date published: 2018-10-24


How do you speed up recycle time with this flash?
Asked by: Anonymous
Its all about heat...so, dont use the modeling light if you dont need it. The temperature where you are shooting will have a big effect on the strobes being able to cool themselves down. When the recycle time gets slow, take a short break (2 - 5 minutes) and give the lights time to cool.
Answered by: Baqi K.
Date published: 2019-05-02


What type of speed ring is required to mount this to Impact Luxbanx Medium Rectangular Softbox?
Asked by: Gregory P.
I have not attached a soft box to me heads as yet. The units themselves are really sweet and completely satisfy my strobe requirements.
Answered by: WILLIAM K.
Date published: 2018-08-25
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