useing four of these to supliment a 600w hps good idea or waste of time?

Thermoplastic Circuitry board material

· 225 LEDs = 165 Red + 60 Blue Mix

· LED Bulb Diameter: 5mm

· Blue light wavelength:460-465 nm

· Red light wavelength: 650-655 nm

· LED Bulbs Power: Power: 13.8
· Voltage: 240V AC

· Australia 3-pin plug

.i

· Lumen(Red/Blue): Red - 7.2Lux x 165Bulbs + 4.5Lux x 60Bulbs

· Recommended Coverage: 45cm x 45cm

· Recommended Height: 0.3-1.5m

· No ballast needed, simply plug it in and ready to play

· Australian C-tick approval N3499, and CE, UL and RoHS

· Size: 31.5cm x 31.5cm x 3.8cm

would be nice to add some lower in the canopy to supplement light. more light is rarely a bad thing. that is if you can keep temps in check.
to really determine if it is worth it you need to find your limiting factor(whats holding you back from more yield) and if it isnt light then it wont make much of a change