Fluorescent tube reflectors double the strength of your light tube and ensure even better lighting throughout your aquarium especially in deep areas the juwel reflectors are suitable for both t8 and t5 high lite juwel light tubes all reflectors include clips for both high lite t5 and t8 the reflector 438 mm fits for following tubes 438 mm 24 watt high lite 438 mm 15 watt t8 reflector 438 mm high lite 24 w t8 15 w the reflector 590 mm fits for following tubes 590 mm 20 watt