This is a 400W replacement HID to LED retrofit bulb from Keystone Lighting. It doesn't work anymore and has been replaced, so why not tear it down?

Using a P2 Phillips screwdriver, you can remove the (easily visible) screws holding the clear lens on. After all the screws have been removed, you can lift the light straight out of the lens.

Using the same P2 screwdriver as before, you can open up the light by removing the screws recessed within the plastic. Once those are removed, you can carefully lift the top off and hang the top off the side of the light.

Next, you will want to unplug the fan from the driver board and remove all the screws from said driver. They are also P2.

Finally, you can lift the driver away from the plastic and either cut or desolder the wires going to the socket.

You can now remove the 4 P2 screws holding the fan down and then remove it from the light.

All of the LED modules are held on with P2 phillips screws. You can unscrew these and lift the modules off the metal base.

To remove both the driver and these LEDs, you will want to either desolder or cut the wires.

If you followed the previous step, you should have already disconnected the wires, so just go ahead and use a spudger to unstick the last few LEDs.

To reassemble your device, follow this guide in the reverse order, making sure to re-connect all disconnected wires.