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Author Topic: LED Light Panel for flats  (Read 1510 times)

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Offline chris.bailey

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LED Light Panel for flats
« on: 09:16:16, 09 June, 2014 »
Saw these being suggested for flats elsewhere so decided to try one out

http://www.amazon.co.uk/Huion-Inches-Adjustable-Brightness-Tracing/dp/B00J3NRAV2/ref=sr_1_15?ie=UTF8&qid=1402300991&sr=8-15&keywords=HUion

This A4 panel can be powered by USB so good for mobile use and for those of us with CCDs with a mechanical shutter, the ability to dim the screen is very useful in adjusting exposures so as to be long enough to avoid shutter shadow. So far I have only had a quick play with RGB and L filters but the results so far are very encouraging with flats taken with the panel rotated 180 degrees cancelling each other out very well indeed.  Ha will be the real test as LED frequency spectra tend to be weak in Ha wavelengths. I would say the A4 panel to be good for scopes up to 8" so it is pretty versatile. Being only a few mm thick, it sits easily in a laptop bag and seems reasonably robust.

Pricewise they are pretty competetive against EL panels and against Ger Neumann flat panels they are a snip.

C.

LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
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Samyang 135mm f1.8

Offline ChrisLX200

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Re: LED Light Panel for flats
« Reply #1 on: 10:45:19, 09 June, 2014 »
I was thinking of trying one for the 10", I have an EL panel big enough for the fracts but one large enough for the SCT costs £££. The EL panel is very poor for SII flats being predominantly blue-ish, and pretty slow for Ha too, but it will do it with long enough exposure. With SGPro, once set it is all automatic anyway so I can just walk away and let it get on with it.

ChrisH
Chris Heapy - current: 10-Micron GM2000HPS-II U/P, G11/Gemini, TV NP127is, Altair 8" RC, TV Genesis SDF, TV Pronto, SW Equinox 80ED, 10" LX200, 12" f/5.4 Newt, Vixen 90mm.
Atik 490EX, Atik EFW, Baader LRGB filters, Astrodon 3nM NB filters, Lodestar, QHY5L-II all-sky, Canon 70D and 350D
Whirley Obs., MPC Code Z89

Offline chris.bailey

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Re: LED Light Panel for flats
« Reply #2 on: 11:12:29, 09 June, 2014 »
Chris

Yes a 315mm Gerd Neumann panel is silly money ~£200. I have a smaller one and have had to attenuate it quite a bit as its just too bright.

Subject to a few more tests I am planning on getting an A3 one for the RC10 and mounting it on stand-offs on the wall of the obsy so it sits on the line of my park position. I can then leave it running off the flats at the end of a session.

On the RGB flats I tried, the exposures to get to an ADU of 20,000 were very similar so it looks like the spectrum is reasonably uniform.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline chris.bailey

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Re: LED Light Panel for flats
« Reply #3 on: 19:25:45, 09 June, 2014 »
Below a debayered flat with a OSC camera (a huge test for a flat light source) and whilst it is slightly green dominant, its as good a result as I have had with a panel of any sort.

C.
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline PaulB

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Re: LED Light Panel for flats
« Reply #4 on: 06:31:58, 10 June, 2014 »
Thanks, ChrisB.

This is just what I need for the C9.25.
Paul.
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Celestron C9.25.
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Offline chris.bailey

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Re: LED Light Panel for flats
« Reply #5 on: 08:21:10, 10 June, 2014 »
Paul

You will need the A3 version for that. A4 just covers 8". The A3 is not USB powered, a shame but understandable.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline PaulB

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Re: LED Light Panel for flats
« Reply #6 on: 18:43:26, 10 June, 2014 »
I think I'll do as t'other Chris, and buy some Styrofoam and a couple of led light's.

It's cheaper and still effective.
Paul.
"Whirlpool Observatory"
Losmandy G11-Gemini L4.
Celestron C9.25.
Megrez 80 ED II Triplet.
Orion OMC 140
Altair 115ED F7
Coronado PST
Atik 428EX
Atik EFW 2
QHY5L-II.
Modded Canon 1000D.
IOptron Mini Tower II
CCD Images
http://www.flickr.com/photos/paulabrierley/

 

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