Strobe Review: Scubalamp D-Max and Retra Pro Flash

Scubalamp D-Max:

Scubalamp is a Chinese company specializing in dive torches. The overall product quality and prices have given them a good amount of market share. Up until now, however, they have only produced video and multi-purpose lights, so the D-Max is their first try at a flash gun.

Front view of Scubalamp’s D-Max featuring a circular flash tube and central LED light.

Scubalamp D-Max side view. Optical sensor port sticking out at the bottom.

Below are Scubalamp’s stated specifications for the D-Max strobe:

*We (probably like most people) took this part of the specification to mean 15 and 12 frames per second, however, after further clarification from Scubalamp it refers to 15/12 continuous frames taken at 7fps.

At first glance, some of these values certainly seem very promising, particularly flash output, recycle time, and number of flashes at maximum power.

Judging by the spec sheet, with a maximum flash output of 250Ws the D-Max strobe should be significantly more powerful than the likes of OneUW One 160X, Seacam Seaflash 160D, and Retra Flash Pro, which are all in the 150-160Ws class. Battery capacity and recycle time on paper are also well ahead of its main competitors.

The D-Max’s circular flash tube, similar to the ones found in its competitors, should provide even illumination, avoiding hot spots.

The color temperature of 5300K is a bit cooler than what most shooters prefer. Warmer light (lower Kelvin value) gives more pleasing blues in the background of the image so is desirable in tropical conditions. Colder light, like the one produced by the D-Max, would be very well suited to temperate waters, however. Using the included diffuser, the value decreases to around 5000K. This could be further modified by using gel filters, however, all of this decreases the light output of the strobe, as each element placed in front of the flash tube will absorb some light.

It’s important to note that this flash is not compatible with TTL and is not capable of ignoring pre-flashes produced by the camera. Either your camera or the optical flash trigger in your housing will therefore need to be able to emit a single pulse or else the flash won’t be in sync with the shutter leading to incorrect illumination of the scene. While TTL will perhaps not be missed by most advanced shooters, the lack of pre-flash cancellation is a serious limitation that needs to be considered when purchasing the strobe. Most strobes do feature some kind of pre-flash cancellation mode.

When using the neoprene cover, the D-Max is almost perfectly neutral underwater. This certainly helps with trimming the camera rig without using large floats.

What’s inside the package

The Scubalamp D-Max comes in either black or silver and includes in the box one diffuser D100, one standard ball mount, one battery and charger, neoprene cover, and neoprene cap.  

Rear controls

D-Max rear panel. Power dial (left), battery compartment (top), electric sync port (bottom) and mode dial (right).

The controls are located on the rear side of the strobe and mainly consist of two big dials. One acts as a mode dial with positions for off, on, and on+focus light. The second dial allows for adjusting of flash output in 8 steps. It also features a “T” position, which manually triggers the strobe at maximum power when selected. This can be a useful feature for troubleshooting and for creating long exposures underwater. Unfortunately, without the option to adjust the power of that test flash, creative use of this feature is somewhat limited. The back of the strobe also features a display that reads the currently selected power, somewhat redundantly to the power dial, as well as an LED that indicates that the strobe is powered on and also gives an indication of battery level. There are only two levels: over and under 30% and quite confusingly, the strobe shows a green light below 30% and a red light above. For most other strobes 30% would not be an ideal threshold as entering the water with a remaining charge of, say, 31% would likely see the strobe die during the dive. However, in the case of the D-Max, due to its impressive battery life, this seems an acceptable choice as even a 30% charge will give the user plenty of flashes at full power. Unfortunately, there is no ready light on the strobe. The other two features of the back panel are the battery compartment and 5-pin sync cord connector. The fiber optic input is located next to the ball mount along the bottom of the strobe.

All labels on the back, as well as the display, end up being upside-down when the strobes are hanging from strobe arms in what’s the standard configuration for most underwater shooters. While this is not a huge annoyance, it is certainly an easy improvement for a future revision of this strobe to increase usability.

D-Max’s sturdy battery compartment cap.

The battery compartment has a double o-ring seal. Unfortunately, the battery compartment does not appear to be sealed against the rest of the strobe’s internals, so a battery compartment leak will likely damage the whole unit. This increases the importance of proper o-ring maintenance and correct placement of the battery cap. There is also no leak detection system.

Build quality

The chassis of the D-Max is made from a single piece of aluminum that appears fairly robust. The flash tube is protected by a slightly curved acrylic dome that should aid in providing a pleasingly uniform beam. The center focus light is powerful enough for any use except, of course, for serious video production. It is of similar quality as Scubalamp’s dive torches.

The dials and battery cap feel sturdy and are easy to operate without gloves. Using the dials with gloves is far more challenging as they do not protrude far from the back of the strobe. Both dials are the same length, which makes telling them apart without looking more difficult. They do click into place really nicely when turning.

Dials have a nice “click”.


The D-Max comes with almost everything you need: diffuser and neoprene cover, as well as a battery pack and charger. The diffuser is held in place by o-ring friction, which works well when the diffuser is pushed onto the front of the strobe properly. We would generally recommend buying an extra battery as the proprietary batteries will be very hard to obtain should one of them fail on a trip or assignment. This will also help with always having one pack recharged and ready to go.

D100 diffuser mounted to D-Max strobe.

O-ring that provides the friction mount for accessories.

D-Max battery pack.

  1. Introduction
  2. Scubalamp D-Max
  3. Retra Flash Pro
  4. Underwater review and strobe comparison
  5. Comparison and Conclusion