I am going to supply a customer with either 8 new HO tubes and 2 ballasts or an LED retro fit. I don't do much electrical work due to Michigan's laws. I can get all the components from my suppliers and an electrician is going to do the installation. My question is what is the typical mark up range on bulbs and ballasts. He's a good customer so I don't want to screw him but I don't want to leave money on the table either.