Author Topic: Let's talk lighting  (Read 1798 times)

John DeLonghi

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Re: Let's talk lighting
« Reply #45 on: October 31, 2017, 02:11:44 AM »
I got screwed by Amazon. Bought a bunch of the 48 watt automotive LEDs. They claim 48 watts, they actually use only 8 watts.

https://www.amazon.com/gp/product/B01M7TG8ID/ref=od_aui_detailpages01?ie=UTF8&psc=1

 >:(

Getting ready to return these units. Might have to go with a build-it-yourself approach.

To be fair to them, they don't claim they consume 48W in power, they say they are 48W LED output power.
All those LED spots of different types use '3W' LEDs in various arrays, so on that lamp they are using 16 x 3W = 48W.

I have four of those same spots and they're not to bad really, probably fairly close to the claimed LED output power, but they don't compare to the 100W Stratus.

NoDak

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Re: Let's talk lighting
« Reply #46 on: October 31, 2017, 07:47:04 PM »
I got screwed by Amazon. Bought a bunch of the 48 watt automotive LEDs. They claim 48 watts, they actually use only 8 watts.

https://www.amazon.com/gp/product/B01M7TG8ID/ref=od_aui_detailpages01?ie=UTF8&psc=1

 >:(

Getting ready to return these units. Might have to go with a build-it-yourself approach.

To be fair to them, they don't claim they consume 48W in power, they say they are 48W LED output power.
All those LED spots of different types use '3W' LEDs in various arrays, so on that lamp they are using 16 x 3W = 48W.

I have four of those same spots and they're not to bad really, probably fairly close to the claimed LED output power, but they don't compare to the 100W Stratus.
They should then claim 48 watt equivalent, like all the incandescent replacement LEDs do.

John DeLonghi

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Re: Let's talk lighting
« Reply #47 on: November 01, 2017, 02:04:02 AM »
If only all manufacturers of lamps adhered to a common standard, life would be so much easier, but they don't and you'd still get exaggerated claims from the Chinese who generally don't care about misrepresenting their product's specifications.

Fyodor

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Re: Let's talk lighting
« Reply #48 on: November 10, 2017, 12:54:52 AM »
As suggested above, I bought some 100W LEDS, drivers, water cooling... but actually couldn't find the time to assemble it all together. Electronics is not my comfort zone anyway.

When we did some test runs in our lab at work this Wednesday, I brought my Chronos andmy boss brought some old foto studio lights with 1000W halogen burner!

Surprisingly that was absolutely flicker free!

Because halogen is considered outdated these days, these lights are very cheap (I now bought 3 on ebay for 40 total incl. shipping) and give a very good warm white light.

The downside is, that the cheaper ones don't have built in fans, and can be used for 5 minutes only before they need to cool down. But that's why I bought three of them ;).

thebishop

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Re: Let's talk lighting
« Reply #49 on: November 10, 2017, 05:44:19 AM »
Feedback on the godox: no flicker at 9k FPS at least, so looks good so far!

John DeLonghi

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Re: Let's talk lighting
« Reply #50 on: January 05, 2018, 08:25:23 AM »
I've just been doing some more tests with the Stratus lights and I've noticed some flicker at high frame rates I didn't see before.

I'm going to try a different power supply on one to see if that makes any difference but above 7000fps it's quite noticeable at the moment. Strange I didn't notice it before.

I've got an Aputure 300D LED light I'm comparing against the Stratus and I was surprised to find that even using a fresnel on the 300D, the Stratus holds it own against a light costing 7 times the price, but the flicker could be a problem if i can't solve it.

Incidentally, the Aputure also flickers if I set it below 100%, but I doubt I'll ever want to run it on anything other than full power with the Chronos.

Has anyone else using the Stratus seen flicker?
« Last Edit: January 05, 2018, 08:35:17 AM by John DeLonghi »

John DeLonghi

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Re: Let's talk lighting
« Reply #51 on: January 10, 2018, 09:53:15 AM »
Stratus have a new driver board and I've just taken delivery of some and swapped one of the existing boards with a new one.

I've gone up to 38.57kfps with 2.830us exposure and can't see any flicker now. I'm just about to upgrade the other 3 Stratus lights I have with the new driver boards.

The new boards are clearly labelled "100W LED Driver V2" on the back so you can tell if you have the ver. 1 or ver. 2 boards.

I'd say the 4 x Stratus and 1 x Aputure 300D is going to be a good lighting kit.
There's a lot of light there and it all packs up into a couple of cases and will not stress a domestic circuit. It should all run off a 2KW generator if necessary.