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The main difference is that t5 has a way bigger output, like t8 is around 6500-8000 kelvin. t5s have bulbs that have an output of 18000kelvin, not sure what a kelvin equals but it's the brightness, so they're good substitutes for metal halides as they have an output of 10000 to 20000 kelvin. They are far more efficient, give off far less heat and cheaper to buy also you can get a quadruple t5 light so you can get around 70000 kelvin, thats a whole lotta light.

Cheers,

Rusty

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the kelvin rating isnt infact the brightness of the light but the colour of it. the higher the kelvin rating the bluer? the light is for instance a 18k bulb is much bluer than a 10k bulb yes?

the brightness generally is related to the wattage :)

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I think 6500K is daylight, 10000K is a very white light but it's actually slightly blue, 14K-20K get bluer as you can imagine.

Kelvins is the rating given to lights to explain how warm or cold the colour of the tube is.

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