Not even the size of a t5, let alone t8. Only about 6 inches per light. The aluminum panels are not adjustable at all.

The lights are very versatile, the gooseneck holds in place quite well (no movement once lights are set in place) the 3 different light options and the dimmer/brightness are all great. Each of the light modes are super bright and can also be adjusted ...  Read More

The clip-on clamp is quite strong to keep the grow light steady over the seed tray and small plant pots. The clamp is strong but it also needs to be clamped onto something where it has a big depth or else the clamp can fall. The clip is a nice feature...  Read More

The tri head lights have adjustable necks on all three so it is easy to change the positions. The bend is easy and smooth. It's really nice if you don't have a ton of space to set up a large plant stand or table set up.

The built-in timer supports three automatic timing presets of 3 hours, 9 hours and 12 hours. The timer * are good and indeed the different number of hours seem accurate. Multi function timer lets you set it and go.

The timer function requires to be reset almost every day for it to work properly. It creeps up by 20 or 30 minutes each day meaning you can't set it for overnight without getting blasted by light the next day.