Compare LEDs

EvoluChem™ Photochemistry Lights are the Logical Choice:

Compare EvoluChem™ photochemistry lights to Kessil™ photochemistry lights, and you’ll see that the best choice is self-evident. Why fish elsewhere for the best value LEDs?

EvoluChem™ has better-designed photochemistry lights at lower costs than Kessil™

Compare EvoluChem™ to Kessil™

They’re not just a bright idea—They’re also more brilliant & more focused!

compare photochemistry lights

The Difference is in the Details:

Superior Irradiance — Compare EvoluChem™ Lights to Kessil™

EvoluChem™ photochemistry lights are better designed than Kessil™ photochemistry lights because our LEDs are positioned to create more efficient, consistent irradiance.  We designed the EvoluChem™ LEDs to focus the light toward the samples. They have a light beam angle of 25° which allows them to obtain better light efficiency than the Kessil™ light (40°).


Although the total power of LED light is important, it is essential to estimate the amount of light that actually goes on the sample. If the light is spread over a large area, the density 25° of light (irradiance) on the sample will be little. With a more focused beam, the Evoluchem™ LED 18W on average have an irradiance which is 50% higher than a 34W.

Small differences in the distance of the reaction from the light source, as well as the beam angle of the light source, can have significant impacts on the photon flux

Chart of Absorbance v Time

It’s important to choose a light source that will focus the majority of its light directly on the sample. It should not be too small, so as it covers the entire sample. It should not be too large either, as light energy not focused on the sample is wasted.

More Wavelengths — Compare EvoluChem™ Lights to Kessil™

EvoluChem™ photochemistry lights have more wavelengths available than Kessil™ photochemistry lights.

Every HepatoChem light source is tested via radiospectrometry and the corresponding irradiance (listed as mW/cm²). The specific light spectrum is also included with each light source.

Compare EvoluChem™ Light Spectrums
to  Kessil™ Light Spectrums

for yourself

EvoluChem™ light spectrum covers a broader range and allows for more precision and options.

* Source:

Better Quality at a Better Price — Ask Anyone You Know!

EvoluChem™ photochemistry lights cost less than Kessil™ photochemistry lights.  Shop around, and you’ll see we’re right.

Talk with your colleagues and compare what they paid for Kessil photochemistry lights to the cost of EvoluChem photochemistry lights.  Why pay more when you can get a better product for less?

Contact us to request a price!

Go With the Better Alternative

EvoluChem™ LED 390PF

preferable to


EvoluChem™ LED 427PF

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EvoluChem™ LED 440PF

preferable to


EvoluChem™ LED 450PF

preferable to


EvoluChem™ LED 467PF

preferable to


EvoluChem™ LED 525PF

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See our full line of photochemistry lights and learn more

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