bulbs don't give off wattage?I just doubted that it would actually give off that much wattage because I only paid like ten dollars for it, but maybe so.
As a single peice of information, yup pretty useless. I don't think it's irrelevant, however. If he had said "how much light will this 28 inch walmart light put in my tank" and ommitted the wattage, we'd be worse for wear.measuring a bulb's usefulness based on how much watts used to generate the light is impossible
If I am not mistaken, similar to how lumens isnt oriented towards plants response neither is par exactly. Its the best thing to go by, but it weights all light evenyl between 400-700nm doesnt it(? not entirely sure), without regard for any specific wavelength that FW plants photosynthesize at a greater rate? It would be nice if manufacturers started rating light also in par though.lumens don't grow plants though. the only number that matters is par rating at standard depth (24" is good enough to cover most tanks). that info isn't present though.
that bulb would bring more par to the tank; no idea how much though.