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Which Light to Choose

Selecting the right light setting is crucial for accurate PAR measurement

Which Light to Choose

In order to measure accurately, it is required to select the correct grow light setting based on the light source you measure. This guide describes how to select the correct light setting.

LED Grow Lights

If your LED grow light contains only a few or no white LED chips and looks purple, use the LED red / blue setting. If your grow light contains mostly white LED chips and looks white or yellow-ish, use the LED full spectrum setting. Some LED lights that require the LED full spectrum setting might include pure red, pure blue, ultra-violet (UV) and infra-red (IR) chips as well. If your light is mostly blue, use the LED blue / white setting.

HID (HPS, MH) Light Bulbs

If you’re using High Pressure Sodium (HPS) HID light bulbs, make sure to use the Standard or Double-Ended setting based on the connector type. The Metal Halide (MH) setting is used for any MH HID light bulb independent of the connector type.

Ceramic Metal Halide (CMH) Light Bulbs

When using Ceramic Metal Halide (CMH) lights, select the correct light temperature based on the information on your bulb’s packaging. CMH lamps are sometimes referred to as red / warm, which requires the CMH 3000K setting, or blue / cold which requires the CMH 4200K setting. Purpose-built CMH lamps for agriculture require the CMH Agro light setting. All of this information can usually be found on the packaging.

Fluorescent (FL) and Compact Fluorescent Lights (CFL)

If you’re using Fluorescent (FL) lighting or Compact Fluorescent Lamps (CFL) make sure to select the correct light temperature based on the information on your light’s packaging. If there is no exact match on light temperature, choose the setting that comes as close as possible to the indicated number.

No Need to Worry: Get Them All

We received many requests to access all light settings easily, so we've created our Photone Pro offering: Gain complete peace-of-mind by unlocking all light sources, exclusively measure light temperature in Kelvin, access our additional material, and access our Pro support whenever you need it.


Didn’t Find What You’re Looking For?

If you did not find the correct light setting for your grow light or are still unsure which light to choose, please contact our support.

Which Light to Choose