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Sodium Spectral Lamp
Sodium Spectral Lamp (Product Code: SLE/PHY/295) is a discharge lamp used to produce the characteristic yellow sodium light for optics experiments in college and school physics laboratories. It fits a spectral lamp power supply through a 4 pin base and measures 30 mm in diameter and 140 mm in length. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, as part of its optics lab equipment range for India and international markets.
Specifications
| Parameter | Detail |
|---|---|
| Lamp type | Sodium spectral lamp |
| Base connection | 4 pin |
| Diameter | 30 mm |
| Length | 140 mm |
| Operation | For use with a spectral lamp power supply |
| Product code | SLE/PHY/295 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Sodium Lamp Used For?
Sodium light is dominated by the closely spaced yellow D lines, which makes it the standard near-monochromatic source for undergraduate optics. With a spectrometer and a diffraction grating, students measure the grating element or the wavelength of the D lines; with a prism they find the refractive index at a known wavelength. The same lamp illuminates Newton’s rings, Fresnel biprism and air-wedge experiments, where a single dominant colour gives sharp, countable fringes.
A sodium discharge lamp needs a few minutes after switching on before it reaches full, steady brightness, so start it before the class begins. Let it cool completely before removing it from the holder, handle it by the base rather than the glass, and keep the envelope free of fingerprints. Store a spare lamp in its packing so an experiment is not held up when a lamp reaches the end of its life.
What to Specify When Ordering
- Number of Sodium Spectral Lamp units, including spares.
- The make or model of your spectral lamp power supply, so we can confirm it takes a 4 pin lamp of this size.
- Whether a new spectral lamp power supply with lamp holder is needed as well.
Supplier
ScienceLab, the trading name of Jain Scientific Equipments Private Limited in Ambala, Haryana, India, supplies the Sodium Spectral Lamp as a replacement and as part of complete spectroscopy set-ups. We supply colleges, universities, schools and dealers and can quote the lamp together with a power supply and spectrometer. Company details are available on our profile page.
Related Physics Lab Equipment
Use the Sodium Spectral Lamp with these optics items:
- Spectral Lamp Power Supply with Lamp Holder — powers and holds a spectral lamp; ask us to confirm the fit.
- Spectrometer — measures the angles of the sodium lines through a prism or grating.
- Apparatus Newton’s Ring — interference experiment that needs a monochromatic source.
- Prism, Borosilicate Glass — for refractive index measurements on the spectrometer.
- Sodium Lamp Kit — an alternative sodium light source set.
More optics apparatus is listed under Physics Lab Equipment.
Frequently Asked Questions
What are the dimensions of the Sodium Spectral Lamp?
The Sodium Spectral Lamp is 30 mm in diameter and 140 mm long, with a 4 pin base connection. Check that your lamp housing accepts a lamp of this size and base before ordering a replacement.
Which power supply does the Sodium Spectral Lamp need?
The Sodium Spectral Lamp is designed for use with a spectral lamp power supply and cannot run directly from the mains. Send us the details of your existing supply through the contact page, or order a matching power supply with the lamp.
What experiments use the Sodium Spectral Lamp?
The Sodium Spectral Lamp provides yellow, nearly monochromatic light for spectrometer work with prisms and diffraction gratings, and for interference experiments such as Newton’s rings, Fresnel biprism and air-wedge measurements in college and senior school optics.
How should the Sodium Spectral Lamp be handled?
Allow the Sodium Spectral Lamp to cool completely before removing it, hold it by the base instead of the glass, and keep the envelope clean. Give it a few minutes to warm up to steady brightness before taking measurements.
Who supplies the Sodium Spectral Lamp?
The Sodium Spectral Lamp is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, Haryana, India. We supply institutions and dealers in India and international markets, as a replacement lamp or with a power supply and spectrometer.
Request a Quote
Ask for a quotation on the Sodium Spectral Lamp through the contact page, or add it to the enquiry cart and mention the power supply you use so we can confirm compatibility.
Last updated: 24 September 2026
