LED vs. Halogen
LED vs. Halogen
After experimenting with LED lighting for a few years now, I must say, for me anyway, LED is very nice for observation, but I get much better photographs with Halogen.
My experience, can’t speak for anyone else.
Radazz
My experience, can’t speak for anyone else.
Radazz
Arnold, Missouri
Olympus IX70
Olympus BX40
Olympus SZ40
Olympus IX70
Olympus BX40
Olympus SZ40
Re: LED vs. Halogen
Would be interested to see a side by side comparision of the same slide under LED and Halogen lighting if possible
This article is helpful but the images are small:
http://www.microscopy-uk.org.uk/mag/ind ... mpare.html
To me, some of the images shown look better under LED and some under halogen.
This article is helpful but the images are small:
http://www.microscopy-uk.org.uk/mag/ind ... mpare.html
To me, some of the images shown look better under LED and some under halogen.
Re: LED vs. Halogen
Having used only 25w halogen my preference for LED may be skewed in some aspects. The high power LED I currently use enables me to capture at faster shutter speeds/lower ISO via liveview, with less radiated heat, reducing sample drying. The main reason I prefer LED however is rendering and contrast. Perhaps its my ageing eyesight but I find it much better for observations. Details seem to pop more.
I suspect there's no overall winner, personal preference and differences in eyesight being what they are.
I suspect there's no overall winner, personal preference and differences in eyesight being what they are.
Re: LED vs. Halogen
The examples of stained tissues and other colorful objects, shown by David Walker, are impressive. However, I would love to see similar comparisons of less brightly colored and contrast-rich specimens: cells or protists under phase contrast/DIC/brightfield, for example.david_b wrote: ↑Sat Jan 04, 2020 6:16 pmWould be interested to see a side by side comparision of the same slide under LED and Halogen lighting if possible
This article is helpful but the images are small:
http://www.microscopy-uk.org.uk/mag/ind ... mpare.html
To me, some of the images shown look better under LED and some under halogen.
A potentially interesting direction is the more natural-like balanced illumination from a new kind of LEDs, mentioned months ago by MichaelG.
Michael, please help! where were those special LEDs you mentioned, that sport a better balanced spectrum ?MichaelG wrote:...
Re: LED vs. Halogen
My pleasure ...Hobbyst46 wrote: ↑Sat Jan 04, 2020 9:50 pmA potentially interesting direction is the more natural-like balanced illumination from a new kind of LEDs, mentioned months ago by MichaelG.Michael, please help! where were those special LEDs you mentioned, that sport a better balanced spectrum ?MichaelG wrote:...
YUJI ... High ColourRendering Index
See this discussion: viewtopic.php?f=28&t=7536&p=66124&hilit ... dex#p66124
MichaelG.
Too many 'projects'
Re: LED vs. Halogen
Re: LED vs. Halogen
Hi david_b, not these ones, there was some other brand of LEDs, not as yet in microscope illuminators I thing, just the chips... in Australia maybe...david_b wrote: ↑Sat Jan 04, 2020 10:18 pmAre you referring to Olympus True Color?
https://www.olympus-lifescience.com/en/ ... color-led/
Here, Michael pointed them out...
Last edited by Hobbyst46 on Sat Jan 04, 2020 10:42 pm, edited 1 time in total.
Re: LED vs. Halogen
YES!!! thanks.MichaelG. wrote: ↑Sat Jan 04, 2020 10:14 pmMy pleasure ...Hobbyst46 wrote: ↑Sat Jan 04, 2020 9:50 pmA potentially interesting direction is the more natural-like balanced illumination from a new kind of LEDs, mentioned months ago by MichaelG.Michael, please help! where were those special LEDs you mentioned, that sport a better balanced spectrum ?MichaelG wrote:...
YUJI ... High ColourRendering Index
See this discussion: viewtopic.php?f=28&t=7536&p=66124&hilit ... dex#p66124
MichaelG.
Re: LED vs. Halogen
Oh dear, after reading the Olympus paper I want a BX53Hobbyst46 wrote: ↑Sat Jan 04, 2020 10:38 pmHi david_b, not these ones, there was some other brand of LEDs, not as yet in microscope illuminators I thing, just the chips... in Australia maybe...david_b wrote: ↑Sat Jan 04, 2020 10:18 pmAre you referring to Olympus True Color?
https://www.olympus-lifescience.com/en/ ... color-led/
Here, Michael pointed them out...
Re: LED vs. Halogen
Hi together,
the limited output of typical LEDs in the blue-green range around 500 nm wavelength is probably especially disadvantageous for pathologists who look at tissue that is stained in the red-orange range. Warm white LEDs do better in this range and combined with filtering should give a quite nice colour rendering. The LED is very powerful to begin with and can handle some light loss due to the filtering.
I'm planning experiments with the combination of warm-white LEDs and blue-green LEDs for room lighting but haven't really started yet.
Bob
the limited output of typical LEDs in the blue-green range around 500 nm wavelength is probably especially disadvantageous for pathologists who look at tissue that is stained in the red-orange range. Warm white LEDs do better in this range and combined with filtering should give a quite nice colour rendering. The LED is very powerful to begin with and can handle some light loss due to the filtering.
I'm planning experiments with the combination of warm-white LEDs and blue-green LEDs for room lighting but haven't really started yet.
Bob
Re: LED vs. Halogen
MichaelG wrote:...
Looks like some progress since what I have previously seen.MicroBob wrote:...
https://store.yujiintl.com/collections/ ... d-emitters
Here are potential candidates, although I did not look at the specs:
BC Series High CRI COB LED - 135XL - Pack: 10 pcs . 70 USD, say, for a pack of 9W or 5W LEDs, plus shipping. For someone that can build illuminators (including the heat sinks, constant current control etc etc) might come out much cheaper than ready-made Olympus illuminators.
For some very old microscopes, original halogen did not exist, and buying a complete halogen lamp and modifying it to fit the microscope is not inexpensive either.
EDIT: I found an old forum that discusses these LEDs and shows results - for home lights and photography, not microscopy, and even a spectrum, cited in the image below.
I do not know that forum, neither did I compare the spectrum with the manufacturer's data sheet, but anyway, one should look carefully at the specs before purchasing.
- Attachments
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- YUJI LED SPECTRUM.jpg (70.12 KiB) Viewed 9229 times
Re: LED vs. Halogen
I have no actual evidence to support this, but: I would be very surprised if Olympus makes its own LEDs
... It seems more likely that they buy-in the chips from someone like YUJI, and have simply registered a nice descriptive name for the product.
MichaelG.
... It seems more likely that they buy-in the chips from someone like YUJI, and have simply registered a nice descriptive name for the product.
MichaelG.
Too many 'projects'
Re: LED vs. Halogen
Hmmm the only stand I have that I can easily switch between LED and Hal with a trinocular head is my Zeiss Standard with Phase Contrast.david_b wrote: ↑Sat Jan 04, 2020 6:16 pmWould be interested to see a side by side comparision of the same slide under LED and Halogen lighting if possible
This article is helpful but the images are small:
http://www.microscopy-uk.org.uk/mag/ind ... mpare.html
To me, some of the images shown look better under LED and some under halogen.
Also equipped with POL, and I have Reinberg and darkfield filters.
Quite a few comparative options. Sounds like fun, might take a while.
Cool discussion!
Radazz
Arnold, Missouri
Olympus IX70
Olympus BX40
Olympus SZ40
Olympus IX70
Olympus BX40
Olympus SZ40
Re: LED vs. Halogen
I have put Nanodyne LED units on both of the scopes I've used (Olympus BHS/BH2 DIC and Nikon TMD DIC 100W ). Both scopes came with 100W halogen. In both cases the LED was substantially brighter. I mainly went with LED to avoid heating up organisms, so I was less concerned with the photographic aspects.
Re: LED vs. Halogen
Did you find the 100w BHS to be a microbe-boiler?