Godox 150W Video LED Light

Have questions about the equipment used for macro- or micro- photography? Post those questions in this forum.

Moderators: Chris S., Pau, rjlittlefield, ChrisR

Post Reply
mawyatt
Posts: 2460
Joined: Thu Aug 22, 2013 6:54 pm
Location: Clearwater

Godox 150W Video LED Light

Post by mawyatt »

We've received the Godox 150W 16,000 lumen 5600K LED Video light here at Mike's Labs, and did some quick tests to verify the output. This is the brightest continuous source light I've ever seen, like looking at a Xeon strobe that is continuous!!

This light is a standard studio type mount and uses the popular Bowen modifier mount for modifiers, reflectors and soft boxes.

We created a special setup with a test subject (1/8 watt axial resistor), a Mitutoyo 5X with the Wemacro Lens kit (Raynox 150) and a Nikon D850. Used the camera metering to set the proper exposure for each data set for consistency, rather than rely on my eye!! No diffusion was used, and little external light was allowed (darkened room). The light source was placed as close as practical to the resistor test subject, typical of what would be a close-in macro setup. The smaller IKEA light (Cree XPE) allowed a closer positioning, 60~70mm (LED surface to resistor) vs. Godox ~170mm with standard Bowens reflector and ~220mm for the Godox with Bowens snoot.

For starters we used the Cree XPE 220 lumen LED module in an IKEA light, and used ISO from base to 800 while changing the shutter speed for proper exposure. Here's the results.

Cree 220 Lumen LED, Godox 150W 16000 Lumen with reflector, & Snoot at 50% output

ISO - Shutter -Shutter (Standard Reflector) -Shutter (Snoot)
64 1/8 1/250 1/80
100 1/13 1/400 1/160
200 1/25 1/800 1/320
400 1/50 1/1600 1/640
800 1/100 1/3200 1/1250

The "standard reflector" is the supplied reflector with light.

The "snoot" was a standard black anodized aluminum Bowens type ~200mm snoot with inside lined with aluminum foil.

These results somewhat confirm the Godox as a ~16,000 lumen source, note the Godox was held constant at 50% output. A quick test did confirm that 100% was in fact twice the 50% output.

So a ~1ms exposure at low ISO seems reasonable with 3 Godox lights and some light diffusion.

The fan is audible but not annoying, however it does force air out the front of the light which may be a serious problem for some folks. Someone might be able to reverse the airflow by flipping the fan over, but not sure what effect this has on airflow and cooling. There is a lot of power being generated and dissipated in the LED module and heatsink around the Bowens mount.

Anyway, we liked these so much just ordered 2 more!!

Edit:

Here's hands on data collected with a Sekonic L-308DC light sensor. The Godox light with standard supplied reflector was placed 1 meter above the L-308 light sensor and the sensor was setup with the proper "Lumindisc" for reading light intensity in Lux. The ambient light was recorded at 53 Lux. Multiple readings were made and the results consistent as displayed. The Bowens mount reflector supplied with the Godox Studio Strobe 300 was also used, this is a slightly smaller reflector.

Standard Godox SL-150W reflector 180mm diameter by 120mm deep.
Smaller Reflector 160mm diameter by 100mm deep.

SL-150W placed 1 meter above L-308 sensor.

Output setting in %, -Standard Reflector Reading in Lux - Small Reflector Reading in Lux

10-1200-700
20-2200-1200
30-3200-1800
40-4200-2200
50-5000-2700
60-6000-3200
70-7000-4000
80-8300-4500
90-9000-4800
100-10,000-5500

1 Lux is equal to 1 lumen per square meter.

The specifications on the SL-150W output at 1 meter are 7200 Lux and 16000 lumens. Apparently this particular SL-150W is over achieving :D

A detailed inspection of the design and construction is typical modern Godox strobes, very well designed and made.

What is particullary interesting about the overall design is that the ~100mm square cooling fan is located just behind the massive heatsink the large LED COB is mounted on. There is ~100mm of empty space between the back of the fan and the main power supply which sits sideways across the case and is only ~50mm deep and another 50mm space to the main circuit board which mounts directly to the light rear sideways across the light (typical Godox design). Lots of empty space in the case. The LED COB has ~308 LEDs and is a large ~34 x 34mm active surface area.

I suspect that this SL-150W light has undergone an upgrade and still using the same original case with so much empty space. The electronic design looks to be a high frequency switch-mode constant current type with a very efficient switch-mode power supply and with a higher output LED COB. Switch mode power supply design experience revels the frequency can be judged by the physical size of the magnetics and inversely related and also to the main filter capacitor physical size. At 100% output the temperature indication is ~52C with room temperature of ~25C, so only a 27C rise....very good heatsink design and implementation. If there was a previous version this may have used a less efficient LED COB, requiring a more massive power supply which was also less efficient, this would help explain the empty space in the case.

With a similar setup we confirmed the IKEA LED light with the Cree XPE 220 lumen LED is ~220 lumen source. This test was done by projecting the light to create a ~1.13 meter diameter spot and reading the intensity with the L-308 light sensor. Readings were 200~240 Lux with a ambient of 7 Lux, since a 1.128 meter circle has a 1 square meter area, the Lux converts directly into lumens.

Also did a ratio test with the IKEA located at the same 1 meter height above the L-308 light sensor as the SL-150W, this produced a reading of ~120 (127-7) Lux which equates to 220(10,000/120) or 18,333 lumens (SL-150W spec is 16,000).

Anyway, very pleased with this video LED source and ready for some macro use! Only issue may be the fan, which forces air out the front of the light around the LED COB heatsink, and at full power this is quite a bit of heat.


Best,

IKEA light with Cree XPE 220 lumen LED
Image


Godox 150W Light with 16,000 lumen LED
Image
Research is like a treasure hunt, you don't know where to look or what you'll find!
~Mike

mawyatt
Posts: 2460
Joined: Thu Aug 22, 2013 6:54 pm
Location: Clearwater

Post by mawyatt »

Update on this Godox LED light.

Below are images of the light disassembled to study the design. Note the case is a heavy extruded aluminum frame and the massive copper cored heat sink the LED COB directly mounts on. The copper core resides inside a larger 90mm diameter finned heatsink which has a 95mm dia fan directly attached behind. This assembly securely bolts directly to the extruded case front.

The LED COB is a Lighten LTHX1230 -150-06 mounted inside a custom case with protective thin clear glass cover. These COBs can produce up to 190 lumens per watt and are nominal 36 volt at 4.5 amps.

The power supply is a switch mode type that is configured as current mode operation. Optical output commands are issued by the main control/interface PCB and range from 10-100%. Measurements show an LED COB voltage from 29 to 32.73 volts for 10-100%, this will vary some as the LED COB heats up since it's operating under constant current control (current is controlled not the voltage, the COB voltage changes to keep the current at the defined set value). The power supply has two multi-trim pots for setting the minimum and maximum LED COB output. Since the temperature only rises to ~ 52C during 100% output and the LED spec has a maximum of 4.62 amps continuous current, one might be tempted to "crank up" the output (see below) :twisted:

LED COB temperature is sensed with a thermal sensor (2 wire thermistor) which is directly mounted to the LED COB case.

After studying the design it seems relatively easy to add a pulsed capability but this wouldn't directly allow quick outputs because the current control loop is likely a slow control loop and thus limits performance, so only slow responses are anticipated. A custom controller for this may be considered later.

While on a walk the idea of using the RF remote to turn ON and OFF the light by way of a strobe type input, basically just electronically "pushing" the Main Power ON/OFF button acting like a ON/OFF remote trigger. The idea would be to use this "feature" not to directly control the exposure like a strobe/flash (although one could do this), but use the camera for this as normal with continuous illumination and turn ON the light just before the exposure and OFF just after. The concept would allow the light temperature to be lower than continuous ON, but still deliver the required illumination as if the light was continuously ON. As mentioned above possibly opening the door for "cranking up" the light output without increasing the COB average temperature. :twisted:

Of course this involves risk, and not knowing the thermal design parameters and such is at best a guesstimate :roll:

The RF remote was disassembled to investigate the possibility using it as a remote "trigger". After a brief study the button is a simple shunt to ground type directly interfaced to the micro-controller, this should allow a similar type strobe trigger (normally open, trigger to close) using an Optical Isolator, or even a direct input from a RPi GPIO output with a series resistor.

It works!!! :D

The speed isn't quick, maybe something under 500ms, but useful in the mentioned operation scenario.

The actual voltage measurements of the Lighten LTHX1230 -150-06 LED COB compared to the data sheet hint that this may actually be a much higher output COB that has been "throttled back" to met the 150W output (16000 lumens) specification. More measurements should help evaluate this speculation.


Image
Image
Image
Image
Image
Image
ImageImage
Image
Image
Image
Image
ImageImage


This is the LED COB output radiation pattern, note the very broad range.

Image
Research is like a treasure hunt, you don't know where to look or what you'll find!
~Mike

Post Reply