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Old 09-09-2019, 05:55 PM
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Default Spectral Design

Does any one use any of the Spectral Design LEDs from Kurt who builds these?

I have them over two terrariums, and although I like them a lot, I am finding some of my plants are yellowing. Less so turning yellow, but the colors looked washed out and more yellowish versus a deep vibrant green. I get growth, maybe not as much as one would expect. I seem to not get this under my terrariums where I have Flourecent lights on. I have not tried many other LEDs, so it may not be Spectral Design lighting but I see many tanks using LEDs.

I have tried fertilizing with Neptunes Harvest also adding dolomite to it. Neither did much of anything.

I am curious to get peoples opinions on this. Thanks.
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Old 09-09-2019, 07:06 PM
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Default Re: Spectral Design

I use ten SD panels. Explosive growth compared to daylight-ish T5HO.

Some flo tubes will have a better color rendering/higher CRI. This may be what you're seeing, but that doesn't explain the slow growth.

Are the plants actually changing color (i.e. if you put the flo tubes back on, do the plants look normal to you immediately)? If the plants are yellowing, they could be getting too much light (and perhaps photoinhibition explains the slowing of growth).

What flo lamps are you comparing the SD panels to? How long have the SD panels been in place?
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Old 09-09-2019, 07:23 PM
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Default Re: Spectral Design

I actually got interested in the light power of Spectral Design LEDs several weeks ago. I contacted Kurt and asked him if he knew the PAR value of any of his LED hoods, and he said that he didn't. Would that I could find or rent an affordable PAR reader!

I tested the lux level of various heights in my 24*18*24 Exo Terra tank, too, which uses a 22*12" no-spotlight Spectral Designs hood (which is also an extra inch tall, in order to accommodate the MistKing nozzles). The readings ranged from something like 10,000-12,000 lux at ground level (which for me was about at the upper limit of the "lip" of the tank that holds substrate in. I forget the proper name for it), ~20,000 lux at about the highest that plants are likely to grow while still looking attractive, and ~25,000 lux when the light sensor was pressed up against the glass top, as close as it could possibly get to the LEDs. So, not super-high.

My impression of Spectral Design lights is that they aren't a money-efficient grow light if all you want is a grow light. It's for hobbyists who want an attractively built light source that produces a nice light color, low-heat, and no noise, and that can be easily modified to imitate the gradual increase and decrease of sunlight. Of course, not having the stronger spotlight-included Spectral Designs hood of the same size, I don't know if they aren't much more powerful. But that gets expensive

Of course, it could be something else than the lighting. I'm not a plant guru, but yellowing doesn't typically sound like light scorching.
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Old 09-09-2019, 08:02 PM
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Make up a low solution of MgSo4 or Epsom salts. Apply it a couple times in a month.
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Old 09-09-2019, 08:45 PM
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Default Re: Spectral Design

Quote:
Originally Posted by Kinstrome View Post
I'm not a plant guru, but yellowing doesn't typically sound like light scorching.
I should clarify: my point was not that the leaves might be scorching (which I understand to be caused by excessive localized heat from high light). My thought was rather that some plants (notably, the genera of orchids that I like to grow outside of vivs) are a light green tending toward slight yellowing color when pushed with light in order to encourage flowering, and dark green when not provided with sufficient light.

Increasing the amount of light (which I suspect is the case when flo lamps are replaced with SD panels) would tend to lighten the green color of at least some plants, I'm assuming.
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Old 09-10-2019, 03:08 PM
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The three more yellow plants are grown under spectral design in two terrarium. And the same type of plant that are more green are under t5ho and cfls.
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Old 09-10-2019, 03:15 PM
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Default Re: Spectral Design

I am going to add two cfls to an 18x18x18 terrarium but keep the spectral design LED over it as well and see what changes.
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