Its been a while since the last ProdMod LED Camera Light update. I was going to review some brighter LEDs by comparing different brands and technologies. Like Hi-flux LEDs and 1W LEDs. I was also going to go over different ways to dim the LEDs like using a simple potentiometer instead of a resistor near the LEDs or in place of a resistor in the Voltage regulated Vpack. Then I was going to discuss how PWM dimming is better. Well instead of taking you through all those steps, I decided to just show you my latest development. It is a 1W led with PWM dimming control.
So here are some videos that show how much light the ProdMod Camera Light can produce with only one 1W High Power LED running 350mA, and the second video shows the continuously variable dimming that the PWM control allows!
The LED used for these tests is a SSC Seoul P4 (U-bin) SW0 Bare Emitter from DealExtreme. I’d love to sell you these myself, but they sell it for $5.80 free shipping. Not much I can do to beat that. I will include them in a future kit when its ready so you can get all the parts at once.
If you compare it this video to previous videos of the 3LED and 4LED lights, you’ll see that this version doesn’t have dark spots in the corners. Remember this is just one LED, there is room for at least one more if you needed as long as your batteries can offer a total of 700mA.
And here is the same light with PWM controlled dimming.
So not only do you have a brighter camera light, you can also turn it on and off with the press of one button, and use that same button to dim the brightness while maintaining color correctness. Its also a bit easier on the eyes.
The only downside I see is the 1000mAh AAA batteries might only last about 3 hrs, but its not tested yet. And by the way, the 1W leds get very hot and require a heat sink.
Here is a video showing the current levels you can cycle through with PWM. From almost zero up to 0.38A. The power is coming from a DC boost circuit I bought online. It can provide more current with one AAA battery than the Vpack but is less efficient, and its PCB is .630in round making it harder to fit into the ProdMod LED case. You also have this PWM circuit which is also in a round shape at .860in diameter.
Since the Vpack has the slimmest package I tested it with the 1W LED and PWM circuit and found it is only able to product a maximum of 220mA when powered with only one AAA battery. So you could try to fit the 1W LED, the PWM and the single AAA Vpack into your LED Camera light if you are ok with only getting 220mA to the LED.
The 3.3V Vpack only got up to 150mA.
Here is some simple video to show you how the Vpack powered PWM looks when filming the usual shower curtain. Remember this is 220mA.
I then tried the same Vpack powered with two AAA batteries and now have plenty of current. In fact too much current at 100% PWM. So you’ll need a resistor to protect the LED. You can use the Vpack with or without the PWM control, but still need that resistor.
Here is a video showing the current going above 570mA!
So it looks like the 1W LED -Vpack combo may work after all. The challenge is now to fit all the parts in the battery holder. We know the Vpack can sort of fit inside one of the battery bays, but the PWM circuit is .860in diameter.
And yeah, don’t forget about the heat sink. You could buy the emitter with an aluminum plate heat sink and then cut it to size. But that can be messy. I’d rather try to make my own heat sink to fit inside the case and still provide enough cooling to keep the LED from overheating.
In the end I am picturing two versions:
A: 1W led + Vpack + PWM + analog dimmer
B: 1W led + Vpack + PWM + push button control with modes
Do you want to hear more about this development? Leave me a comment below to show your interest. Otherwise I might just move onto something else