I have a 70 W 2 bulb fluorescent light fixture which I want to put a couple of 40 W bulbs into. I know it's generally a bad idea to exceed the wattage rating of a light fixture, but there are 2 things that make me think it may be OK in this case
1) I asked an ex-electrician at my local home improvement store told me that 35 and 40 watt tubes are interchangeable and not to worry (he said the 35 is just an energy saving 40, and the manufacturer put 70 instead of 80 to make the product sound more energy efficient)
2) People on the internet have vaguely suggested that any tube of a certain pin type (in this case T12) is designed to be safely used in a fixture that fits said pin type
Can I use the 40W tubes in the fixture without shortening their life or the life of the ballast?
EDIT: I see a lot of you are suggesting LEDs. As much as I love LEDs, they're not practical for this particular application