|
|
|
|
|
|
|||||||||
 |
|
|
Thread Tools | Search this Thread |
July 20th, 2010, 10:06 AM
|
#1 |
|
New Boot
Join Date: May 2010
Location: Tampa
Posts: 20
|
LED obsession - Indie kit?
Thought I'd start a new discussion so as not to detract from the Z96 LED light thread.
My Pro 160-LED should arrive next week and I'm going to order the Z96 soon. I'd like to build a kit that could be totally battery powered and really portable. I am posting links to various lights that look interesting and I'd like some feedback if you have any thoughts / experience with these lights. We know about Coollights - great quality, limited availability. Now the 900 LED version of that light is out: Then there is this light that looks powerful, but who can tell? Then I just found these - 10W & 12W respectively: Two Comer 1800 videos: 3 point lighting with three 1800s: YouTube - 3-Point Lighting Setup using 3 Comer CM-LBPS1800 lights A single 1800 lighting a stage: YouTube - Using Comer CM-LBPS1800 LED Light On Stage And finally to add the Home Depot element - the 2;20 mark get interesting: YouTube - Stanley 35w HID Spotlight in action |
|
|
|
July 20th, 2010, 10:26 AM
|
#2 |
|
New Boot
Join Date: May 2010
Location: Tampa
Posts: 20
|
Forgot to add this groovy ring light:
|
|
|
|
|
July 20th, 2010, 10:11 PM
|
#3 |
|
Regular Crew
Join Date: Jan 2010
Location: Gold Coast, Australia
Posts: 40
|
I like the idea of this thread.
For outside daylight interviews we currently run 2 Flolight 256 LEDS, but i would have to have something like the: For the odd studio / night shoot we do. |
|
|
|
|
July 21st, 2010, 01:10 AM
|
#4 |
|
Inner Circle
Join Date: Nov 2005
Location: Lowestoft - UK
Posts: 4,046
|
The 35W HID looked interesting from the point of view of a really horrible, splotchy almost parallel beam.
As far as I can tell, so far LED technology is still lacking in beam quality. Brightness is creeping up gradually, but this brings problems in itself. If you have a twenty year old Redhead or Arri 1K Fresnel, you can buy a new one and they match quite well with the old one - so if you damage one of the ones you use to light your greenscreen, you can buy another. If you buy two or four LEDs to wash your new greenscreen, and one dies, the chances are you will need to buy multiples to ensure the replacements all match. Even identical models, bought a few months apart exhibit differences because the manufacturers buy the LEDs in batches, and each batch is slightly different. The things produce very uneven light, and although with a bit of diffuser on the front they're much better - they are still quite random in nature. Look at the traditional tungsten kit - all the manufacturers provide proper photometric data. LED manufacturers don't. Maybe the odd brightness figure but in general, they're very keen on power consumption of the LEDs - so many 10W LEDs or more 3 W LEDs. What does the beam look like? No idea. Will it look the same as a Tungsten fixture? No. You can dim a tungsten lamp, all that happens is the colour temp drops. LEDs that do have DMX control start to get flickery, so look even worse. All these new bits of kit are quite interesting, and the heat reduction alone is good reason to buy some - but the beam quality as an illumination source is not really up to it. (Yet). It's interesting to note that in the entertainment industry, LED is working really well - not so much as illumination tools, but as interesting things to look at. However, when they want to throw even light onto a large white cyc - people moan about the evenness. In pubs and clubs, however, they're great for throwing colour onto a stage. |
|
|
|
|
July 21st, 2010, 05:18 AM
|
#5 |
|
New Boot
Join Date: May 2010
Location: Tampa
Posts: 20
|
Hey Paul,
So you're saying I should buy them all ;) Sorry, I couldn't resist. Each of your points are real concerns that we should be thinking about. I had not considered color matching down the road. I'm still going to pick up some inexpensive lights to mess with; I can't help myself. You're right about that HID - it is ugly, but would look great as searchlight. |
|
|
|
|
July 21st, 2010, 03:09 PM
|
#6 |
|
New Boot
Join Date: May 2010
Location: Tampa
Posts: 20
|
This is new... and interesting. 3000 lumens.
He's using this panel here that I've been seeing: |
|
|
|
|
July 29th, 2010, 06:14 AM
|
#7 |
|
Major Player
Join Date: Jul 2010
Location: Down South, IN
Posts: 422
|
Led light CN-160 L.A. Color Shop
I got my CN-160 in the mail yesterday from L.A. Color Shop
Tried all of my Sony batteries. The only one that fits is the NP-F750 ! ...it's loose fitting and I have to put a piece of plastic wedge in the case to keep it on. Poor design...dont think I could trust it working on a shoot. Guess I will have to use the AA batteries..havent tried them yet. Jeff |
|
|
|
|
July 29th, 2010, 09:17 AM
|
#8 |
|
New Boot
Join Date: May 2010
Location: Tampa
Posts: 20
|
Jeff,
Bummer about the battery fit. My 160 should be here any day now. I'll check it out and let you guys know. |
|
|
|
|
July 30th, 2010, 08:09 AM
|
#9 |
|
Inner Circle
Join Date: Nov 2005
Location: Lowestoft - UK
Posts: 4,046
|
I think one of the big problems with LED lighting in the present state is that unlike our older tools, LED lighting has somewhat vague specifications - so it's really difficult to make sense of X number of Lux, or Lumens, or Footcandles - and nobody really has yet come up with a system for assessing lighting fixtures that have multiple individual sources. This is especially true when some fixtures handle brightness by selective switching of individual circuits of LEDs - so as they get dimmer, the field gets worse. If on the other hand you start to dim LEDs, then the darn things flicker.
With proper optics, measurement is far easier, because the quality of the light is taken for granted. We're only interested in condensing or spreading it, or maybe diffusing it, or even chopping bits of it out. With LEDs, the individual sources don't have any verifiable standard. Ok - a fixture might have a certain amount of White (or coloured) 3W LEDs - but rarely are we treated to any info on these. 3W power consumption? Presumably. How much output, over what individual angle? My (admittedly limited) experience is that a single led does not have a symetrical light distribution, it's rather ragged, with a few visible darker areas and maybe a highlight or two - but an identical one has these defects in different orientations - so making a fixture from a cluster is rather a random product. The other thing is that they have very long lifespans, measured by MTBF - but in a quick check recently, out of 12 fixtures, each one with 150 odd LEDs, there were two individual elements missing. I'm positive LEDs will become the best tool - I'm not sure they're quite there yet. The Chinese seem to simply be building them as a piece of electronics, easy for them - and to be honest, I suspect that making one could be a DIY kit for anyone who could solder competently - and what have we got? $400 pieces of kit in a $10 case, using maybe $50 worth of electronics? No complex, expensive optics, not problems with heat constraints - simply a power supply, a bag of cheap bits and a box! Look at cheap childrens LED toys, Christmas Trees - rubbish like that. It costs small change to make - and these things we see on ebay are really very overpriced for the content. A 3W LED can be sourced for pennies! |
|
|
|
|
July 30th, 2010, 09:06 AM
|
#10 |
|
New Boot
Join Date: May 2010
Location: Tampa
Posts: 20
|
Paul,
I appreciate the time you have put into your well thought out and reasoned opposition to the current state of LED lights. This was / is not a debate of the pros and cons of LEDs. I was merely interested in people's experience with the current lights on the market. I agree that LEDs have a ways to go. However, that is another conversation entirely. Anyone else have actual experience with these any of these lights? |
|
|
|
|
August 2nd, 2010, 06:06 AM
|
#11 |
|
New Boot
Join Date: May 2010
Location: Tampa
Posts: 20
|
It now looks as if the 1200 LED light is being sold:
On a side note, I got my Pro 160-LED on Friday. I'll echo what everyone has said, it is light, flimsy and of dubious quality, but it does put out some light. I'll post a side by side comparison with my Z96 when it arrives, hopefully, this week. |
|
|
|
|
August 3rd, 2010, 08:36 PM
|
#12 |
|
Trustee
Join Date: Jun 2010
Location: Seattle WA
Posts: 1,255
|
Need a standard test for comparison
The problem with many products from Asia, and it seems particularly from China, maybe because they export so much, is that they start off by filling a void and they're constructed of what ever materials there are. This happened back in the days of sailboats in Taiwan in the 1970s and now it is China with the LED lights discussed in our forum. They look good in pictures but when you finally get to touch one it is a little less than what you had hoped for.
What is needed is some testing, and since no test lab has stepped forward to do it, maybe it could be done with individuals. For example: 1. Light pattern. Lay out a standard grid on a white wall, use push-pins and dark string or thread, mark off a grid, say 1-ft for the USA or 1-meter for the rest of the world, set up the light on a stand at a certain distance from the wall, then take a picture of the pattern. Submit the picture of the test setup and light pattern to the forum which could make these available for viewing by the cast of thousands. 2. Provide a discussion of the construction of the light fixture, kind of materials, quality of construction, functionality, etc. 3. Light output: color, quantity - now this would be harder - open for discussion. Unless the tests use the same measuring instruments or meters it would be just order of magnitude. |
|
|
|
|
September 17th, 2010, 07:23 AM
|
#13 | |
|
New Boot
Join Date: Oct 2005
Posts: 22
|
CN-160 v Z96
Quote:
|
|
|
|
|
|
September 17th, 2010, 07:16 PM
|
#14 | |
|
Regular Crew
Join Date: Jan 2007
Location: Hemet, CA.
Posts: 87
|
Quote:
Mind you manufacturers have ZERO interest in demystifying light output and making it possible to compare apples to apples. |
|
|
|
|
|
September 19th, 2010, 08:51 PM
|
#15 |
|
Regular Crew
Join Date: Feb 2007
Location: Ontario Canada
Posts: 113
|
Interesting concept Mark but it won't give you anything but a comparison between fixtures tested, no usefull photometrics. What your suggesting is essentially an anechoic chamber for light, the desire is to only record the original light source without any influence from reflected or incident light on the readings, an 8' wide painted box just ain't gonna do this for you. You would still get a good comparrison between fixtures because the testing environment is repeatable and controllable but it will not provide any data to compare with anyone elses data for comparisons outside your environment. If you look at the Creamsource website they have a similar LED testing method showing the results as a fun tool to view certain fixture side by side.
If you want to ramp up your idea add 45degree angled slats along your trailer walls angled back towards the source to kill most of the incident reflections. Looking forward to your results. |
|
|
|
|
| ||||||
|
||||||
|
|
