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    "title": "AM0 and AM1.5G in One Simulator: Ooitech Launches LED Source",
    "description": "Ooitech has released a steady-state LED solar simulator that switches between AM0 and AM1.5G, 300 to 1800 nm, class A+ in every graded band.",
    "keywords": "AM0 solar simulator, AM1.5G LED simulator, space photovoltaics testing, perovskite cell IV test, IEC 60904-9 spectral match, steady state LED sun simulator, ooitech",
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            "level": 1,
            "text": "AM0 and AM1.5G in One Simulator: Ooitech Launches LED Source"
        },
        {
            "level": 2,
            "text": "AM0 and AM1.5G in One Simulator: Ooitech Launches LED Source"
        },
        {
            "level": 2,
            "text": "Why a ground simulator cannot qualify a space cell"
        },
        {
            "level": 2,
            "text": "Xenon or LED: the trade, and the part left unsaid"
        },
        {
            "level": 2,
            "text": "What Ooitech is releasing, and what it is for"
        },
        {
            "level": 2,
            "text": "How to read the grade for yourself"
        },
        {
            "level": 2,
            "text": "Why perovskite work cares about this more than silicon does"
        },
        {
            "level": 2,
            "text": "What to ask any supplier, including us"
        },
        {
            "level": 2,
            "text": "Availability and related equipment"
        },
        {
            "level": 5,
            "text": "Tags :"
        },
        {
            "level": 5,
            "text": "Table of Contents"
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        {
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            "text": "Category"
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        {
            "level": 5,
            "text": "Recent Post"
        },
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            "level": 6,
            "text": "AM0 and AM1.5G in One Simulator: Ooitech Launches LED Source"
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            "level": 3,
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        },
        {
            "level": 2,
            "text": "We deliver expertise you can trust our service"
        },
        {
            "level": 3,
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        },
        {
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    ],
    "wordCount": 2355,
    "markdown": "# AM0 and AM1.5G in One Simulator: Ooitech Launches LED Source\n\n> Ooitech has released a steady-state LED solar simulator that switches between AM0 and AM1.5G, 300 to 1800 nm, class A+ in every graded band.\n\n![AM0 and AM1.5G in One Simulator: Ooitech Launches LED Source](https://cdn.ooitech.com/static/upload/image/20261030/am0-led-simulator-cover.png)\n\n- ** Ooitech Editorial Team\n- ** 2026-10-30\n- ** 219 Views\n- ** [News](./News.html)\n\n## AM0 and AM1.5G in One Simulator: Ooitech Launches LED Source\n\n**Quick answer:** Ooitech has released a steady-state LED solar simulator that switches between the AM0 space spectrum and the AM1.5G ground spectrum on one platform. Spectral range is 300 to 1800 nm, all three IEC 60904-9:2020 ratings sit at class A, source life is 20,000 hours or more, and the standard illuminated area is 300 by 400 mm, built in modules so it can be enlarged. The two applications are space photovoltaics, where the spectrum outside the atmosphere is the design reference, and perovskite cells, where reproducibility decides whether two measurements can be compared at all. The specification below is ours; the grading data comes from the instrument's own evaluation software.\n\nA xenon lamp and an LED array have been arguing about solar simulation for twenty years. The argument is settled enough to be predictable, and the interesting part is what neither side says out loud.\n\n## Why a ground simulator cannot qualify a space cell\n\nAM0 is the spectrum outside the atmosphere: no Rayleigh scattering, no ozone, no water vapour, no path through air at all. AM1.5G is what survives 1.5 atmospheres of it. The two are not a brightness apart. AM1.5G carries deep absorption notches where water and oxygen absorb, and a smaller share of its energy sits in the ultraviolet. An AM1.5G lamp asked to qualify a satellite cell therefore reports a current the cell will not see in orbit, and understates the ultraviolet that drives coverglass darkening, adhesive yellowing and coating degradation.\n\nThe instrument that does the job properly, the space solar simulator, is decades old. What has been scarce is one that holds the space spectrum steady through a campaign. Qualification is not one flash. It is hundreds of hours of IV sweeps, thermal vacuum cycling and repeated spectral response scans, and drift in the lamp turns up in the data as a property of the cell.\n\n## Xenon or LED: the trade, and the part left unsaid\n\nThe classical space simulator is a steady-state xenon arc, and its argument is coverage. With the right optical design it matches AM0 across the whole range, and it carries the measurement tradition of the field behind it. Its cost is lamp hours. A xenon arc is typically rated near a thousand hours, and as it ages its output drops and its spectrum drifts. When every recalibration costs a working day and every lamp change costs a warm-up plus a spectral scan, long campaigns become expensive and their data harder to compare.\n\nLEDs invert the trade. They last, they switch in microseconds, they put almost no heat into the sample plane, and a multi-channel array can be trimmed band by band. Their weakness is the one xenon does not have: available wavelengths. Commercial bins leave gaps, and for a silicon cell the near-infrared is where gaps hurt most, because the longest-wavelength current comes from exactly there.\n\nThat used to make the choice simple. Xenon bought spectrum, LED bought hours. The change is arithmetic rather than philosophy: once enough bins exist across 300 to 1800 nm and enough channels are driven independently, the spectrum can be built instead of inherited, and the constraint moves from the lamp to the binning and the calibration of the array.\n\n## What Ooitech is releasing, and what it is for\n\nThe new unit is a steady-state LED simulator with AM0 and AM1.5G as selectable source spectra, one keypress apart on the same platform. It is available now. The specification as published:\n\n| Parameter | Specification |\n| --- | --- |\n| Source | Steady-state LED array, independently driven channels |\n| Spectral range | 300 to 1800 nm |\n| Spectral match | Class A, graded band by band to IEC 60904-9:2020 |\n| Irradiance non-uniformity | Class A |\n| Irradiance instability | Class A |\n| Source life | 20,000 hours or more |\n| Standard illuminated area | 300 x 400 mm, modular and expandable to order |\n| Selectable spectra | AM0 and AM1.5G, switched on one platform |\n| Typical work | Space cell and module IV; perovskite efficiency; aerospace material and coating ageing; photodetector spectral response; payload light reliability |\n\nThe reason to build both spectra into one machine is a test sequence rather than a preference. A line that qualifies space cells and also sells terrestrial products does not want two source heads, two calibration files and two drift histories for the same sample plane.\n\n## How to read the grade for yourself\n\nSpectral match is not a statement about brightness. It is a statement about shares. IEC 60904-9:2020 splits the spectrum into bands and compares the fraction of irradiance the lamp delivers in each band with the fraction the reference spectrum delivers. In the 2020 edition the class A+ window is 87.5% to 112.5% per band, class A is 75% to 125%, and the classes widen from there. A lamp can be dimmer than one sun and still be class A+ on spectral match, because the metric normalises by total irradiance.\n\nBelow is one grading run from the instrument's evaluation software: unit 1202069U1, a 2048-pixel spectrometer, 50 ms integration, six reference bands between 400 and 1200 nm.\n\nLeft: measured and reference share of irradiance in six bands, 400 to 1200 nm. Right: the ratio per band against the class A+ window of 87.5% to 112.5%. Data from one grading run in the instrument software, unit 1202069U1.\n\n| Band, nm | Measured share | Reference share | Ratio | Grade |\n| --- | --- | --- | --- | --- |\n| 400 to 470 | 13.93% | 15.21% | 91.6% | A+ |\n| 470 to 561 | 17.15% | 17.14% | 100.1% | A+ |\n| 561 to 657 | 16.98% | 17.57% | 96.6% | A+ |\n| 657 to 772 | 20.39% | 18.13% | 112.5% | A+ |\n| 772 to 919 | 17.58% | 18.36% | 95.7% | A+ |\n| 919 to 1200 | 13.97% | 13.92% | 100.3% | A+ |\n\nTwo things are worth reading off it. The worst band is 112.5%, which sits exactly on the edge of the class A+ window, and the best is 91.6%, so the spread across 800 nm is a little over six points. And the absolute irradiance in that same scan was 133.2 W/m2 against a reference of 836.1 W/m2 over 300 to 1200 nm, because the intensity was set low for the spectral scan. That is the honest reading: the shares were graded at reduced intensity, so only the ratios are quoted here, and an acceptance test on a customer floor would be run at working irradiance.\n\nThe AM0 grading uses six bands from 300 to 1800 nm instead of the AM1.5G set, so the ultraviolet window and the near-infrared window are each judged on their own share. That is where the two standards differ most, and therefore where a lamp has to be measured rather than assumed.\n\n## Why perovskite work cares about this more than silicon does\n\nSilicon is forgiving about spectrum in one specific way. The wafer is thick, it absorbs everything above its bandgap across the visible and much of the near-infrared, and its current follows the total photon count above 1.1 eV. A perovskite absorber is thin, its bandgap sits near 1.6 eV, and the photons it uses are concentrated in a narrower window. Move a lamp's energy from 400 nm to 700 nm and a silicon reference cell barely notices, while a perovskite cell's current moves.\n\nIn a tandem the effect compounds, because the two subcells are current-matched, and the matching condition is a property of the spectrum rather than of the stack alone. A blue share that drifts by a few percent moves the matching point, and the measured efficiency moves with it. For a laboratory comparing one cell against another, that is worse than an absolute error: it reorders the results.\n\nSpace makes it harder again. Perovskite is the most promising absorber for satellites and the least proven one there; work published this year found a perovskite device down about 20% after 100 thermal shock cycles, a regime silicon takes in stride. [That result](https://www.ooitech.com/martin-greens-team-stop-falling-for-the-perovskite-in-space-hype-20-loss-after-just-100-cycles.html) is worth reading before any space efficiency number is taken at face value.\n\nWhich is why the useful property of a steady-state source is not peak accuracy on the day of installation. It is that the same spectrum arrives on day 300.\n\n## What to ask any supplier, including us\n\n- A per-band grading sheet in the band set that matches the reference spectrum you will run, not a single headline number on a brochure.\n- The conditions of that run: intensity, integration time, spectrometer resolution and the date it was taken.\n- Drift data over the first 1,000 hours of operation. Rated life says when the source is replaced; drift says whether it can be trusted next quarter.\n- A uniformity map over the full illuminated area at working distance, because the cell you test is smaller than the port and you will place it somewhere.\n\nOoitech supplies the grading sheet with the machine, and we would ask the same four questions of anyone else.\n\n## Availability and related equipment\n\nThe AM0 and AM1.5G LED simulator is available now, with the standard 300 x 400 mm area and larger illuminated areas to order. For cell-level IV work on the same bench the matching instrument is the [OTCT-A solar cell tester](https://www.ooitech.com/OTCT-A-Solar-Cell-Tester-High-Precision-Electric-Performance-Testing-Equipment.html); for module-level flash testing there are the [OTMT-A](https://www.ooitech.com/solar-panel-tester-sun-simulator-otmt-a-aaa-class-solar-module-iv-tester-ooitech.html) and [GIV](https://www.ooitech.com/gsolar-solar-panel-tester-sun-simulator-giv-20a2616-a-a-a-class-solar-module-iv-tester.html) simulators. If you need a spectrum matched to a reference other than AM0 or AM1.5G, that is a configuration question rather than a new machine.\n\n---\n\n##### Tags :\n\n![](/template/ooitech/assets/img/shape/06.png)\n\n![](https://cdn.ooitech.com/runtime/image/w800_h700_fitblur_v2_w800_h700_fitblur_v2_1757399770541443.webp)\n\n### Request A Quote\n\nAll uploads are secure and confidential.\n\n## We deliver expertise you can trust our service\n\nDirect-from-Factory Equipment.\n\n![](/template/ooitech/assets/img/icon/money-2.svg)\n\n### Cost-Effective Advantages\n\nWe deliver exceptional value, maximizing results while optimizing budgets for clients.\n\n![](/template/ooitech/assets/img/icon/staff.svg)\n\n### Our Experience Team\n\nOur skilled professionals specialize in innovative solutions and tailored strategies.\n\n![](/template/ooitech/assets/img/icon/certified.svg)\n\n### 15+ Years Industry Experience\n\nDeep expertise ensures reliable, trend-aware, and proven outcomes for success.\n\n![](https://cdn.ooitech.com/static/upload/image/20250910/1757477357667605.webp )\n\n![](https://cdn.ooitech.com/static/upload/image/20250910/1757477724911512.webp)\n\n![](/template/ooitech/assets/img/shape/06.png)\n\n## What Our Client Say's about us\n\nClient testimonials praise our deep understanding of their challenges, which leads to innovative solutions and strong ROI. 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