How can I open a fluorescent light fixture in a drop ceiling?

This is a drop ceiling in a 70s era basement. The fluorescent fixtures are recessed into the ceiling with plastic covers that the light shines through. It's the typical flourescent fixture. I thought one side would have a hinge and the other side would drop down, allowing you to get to the bulbs. But I've tried many times and can't figure out how to get it open. Neither side seems to open easily. One side has what looks like metal clips that I assumed were holding the non-hinged side in place, but they don't seem to come loose.How can I open a fluorescent light fixture in a drop ceiling?
Sometimes you have to use a small screwdriver to budge the small metal clips, that swing down to release the frame of the lens. then the frame will swing down to gain access to the bulbs. Then, again some will slide to one end to let down the lens ( plastic cover ) to get at the bulbs.How can I open a fluorescent light fixture in a drop ceiling?
oh dear the clip are tight because of the heat .comeing off the lights,and old age, try wearing aglove and pop them up with a flated screw driver they tuff and wont breck ok , they should click back into place, the plastic is just old ,it will come off if you press up and get something to weg in between the side of the plastic, most have a white plate on the edge right hand side of the unit,glad to enlighted you lol
Jimmy, your'e right on track...those tabs open the bottom half...must be rusty from sitting so long, yhe hinges are on the inside...just keep workin at it..it will come loose..JOE