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Since you have the lights already in your possession you should be able to get a very good idea if they will work. Use a lux meter or the lux meter app for a smart phone and take a reading the same distance from the light as your substrate will be (also position it so you take readings from off center to get an idea of what light will be like throughout the tank not just directly under the light). Then take that reading and divide by 80. This will give you a very rough approximation of par.

My biggest concern with a light like this is how well it will render colors. Ideally you want a light that will make all the colors look true to life as if it were being displayed under sunlight. This is basically impossible to accomplish but we can get close with high CRI lights (over 90+). I have no idea what CRI this light is but chances are if they don't mention it on the sales page its pretty low.
 
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