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There are even led tubes made to retrofit t5 and t8 fixtures (altrough some need you to replace the starters and ballast for them to work). But those are very expensive option in my opinion, you'd be better with buying a cheap led panel.. or building one from led screw in bulbs (e27 socket type), with the light diffuser (plastic bulb on top) cut off.
I used some of those retrofits in my home to avoid changing fixtures when upgrading to led, but never for growing.
Led strip is usually low power and low penetration anyway so you would need a lot of it to be useful.
The weed you grow tomorrow starts with the stuff you buy today. The money I saved growing my own, far outweighs any "budget cuts". Buy good quality stuff and you will get good quality weed, (within reason). IOW, buy what you can afford and, if you can't buy reasonable, then wait until you can. You'll be glad you did