Laser 2000

Semrock Searchlight

The premier modelling resource for fluorescence microscopists and optical system designers.

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SearchLight is a free, online spectral plotting and analysis tool that allows fluorescence microscope users and optical instrument designers to model and evaluate the spectral performance of fluorophores, filter sets, light sources, and detectors as components of an overall system. Its intuitive user interface makes it easy to manipulate spectral component specifications and plot spectral results. The System Calculator allows the user to quantify system metrics including signal, SNR, and bleed-through; as well as to compare various system configurations against each other.

Any number of spectra may be plotted simultaneously, and an entire graphing session sent to colleagues for collaboration using the “Share” feature. SearchLight sessions can also be saved into your personal account for future use.

SearchLight contains an extensive library of over 800+ fluorophores, 150+ light sources, more than a dozen detectors, and Semrock’s entire library of filters and filter sets. “MyData” allows you to upload your own custom datasets for any components not currently included as a selection choice.

  • Evaluate and optimise your system configurations
  • Save/Share/Export your results for better collaboration
  • Find compatible products for a selected fluorophore
  • Narrow list of potential exciters, emitters, dichroics, or filter sets
  • Take advantage of the regularly updated databases
  • Save time in the lab and make every photon count with Searchlight

To watch a short video tutorial (3.32 minutes) on SearchLight and helpful tips visit

SearchLight was one of the featured tech products on Discover Channel airing on January 6th, 2017. Enjoy the following feature.

New SearchLight App for your mobile device

We offer a SearchLight App available for iOS and Android mobile operating systems. Now you have all the popular features available from the SearchLight plotting tool right at your fingertips anytime, anywhere.

  • Access SearchLight offline even without internet connectivity
  • Save your sessions locally on your iOS or Android based mobile devices when offline
  • All data syncs with your on-line account when you reconnect

Downloading this App is free and easy. Simply search for “Semrock” in the Apple App Store or Google Play Store and follow the download instructions for SearchLight.

SearchLight App available for iOS and Android. Advanced features for data management as well as simulations can be accessed using




The Compare System Calculator

SearchLight Compare System Calculator feature quantitatively computes the fluorescence signal, noise, and signal-to-noise ratio for unlimited combinations of filter sets, fluorophores, light sources, and detectors. Calculations are based on a straightforward mathematical framework, which is described in detail in the white paper Spectral Modeling in Fluorescence Microscopy.

SearchLight Calculator takes into account all the spectral components of a typical epifluorescence microscope configuration.

Click to download the SearchLight Datasheet


What's New?

We’ve recently refreshed our website, and we hope that you will find the changes to be a big improvement. We’ve worked hard to make it easier to navigate the site, and to find exactly what you need from among our vast and diverse range of products.

Missing e-commerce?

One thing that we’ve not carried over from the previous site at this time is the facility to order online for a select range of our products, which you may have been used to in the past. “Off-the-shelf” items represent a small part of our product range; most often a purchase requires a more in-depth discussion between our sales team and the customer to match the right product to the user’s application. For this reason we have focussed on making it as easy as possible to request a quotation from our sales team.

Please rest assured that we will get back to you with pricing promptly, and will work with you to make sure the products you buy are exactly what you need. Once you’re ready to order, our sales team will work through the process with you, to make it as seamless as possible.

Once you’ve selected all the items you’re interested in, by clicking “Add to Quote” on the product page, just click “View Quote Request List” or the icon in the top navigation bar, check your list, set quantities, complete your details and submit the form. Our sales team will respond by email, in a timely manner.

If you have any other questions in the meantime, please get in touch directly.