I harvested 440gm from a 2' X 4' (60cm x 120cm) tent, flowered under 315W of 3000°K Citizen CLU048 COBs. That works out to be 592gm / m2, or 1.4gm / watt. There are eight 3000°K Citizen CLU048 COBs in the array on 30cm (one foot) centers.
Candida - Breeder: 400gm/m2 Harvest: 93gm/3sq ft or 334gm/m2
Cream & Cheese - Breeder: 600 gm/m2 Harvest: 347gm/5sq ft or 747gm/m2
The harvest was 83.5% of the breeder's estimate for the Candida, and 124.5% of the Cream & Cheese's breeder estimate. Overall, the harvest was 9.125% over the breeder estimates.
This is presented as results without a UV or IR component. Unfortunately, I don't have similar figures for the Mars Hydro TSL-2000. The spectrum from the TSL-2000 seems to have more of the blue in it than the COBs I used, so I don't know if this is comparable. Also, the tent was sized differently, and the plants were trained to produce seed, not the maximum flower possible.
From a grower's perspective, I don't know if the addition of UV would increase the harvest, or shorten the flowering time. Mars Hydro would need to test this. As a grower, I'd need to ask "What's in it for me?" Is the loss of some of the current LEDs worth it, if Mars Hydro replaces them UV? If Mars Hydro chooses to redesign the circuit board for the LEDs to add UV, will the increased cost be worth it?
From a marketing perspective, I think it's worth adding to the lights. Mars Hydro would be able to advertise a spectrum enhanced with UV and IR. This could be important if other light manufacturers start pushing it.
The future I see in grow lighting is modules that can be linked together mechanically and electrically to form a single light. This would reduce shipping costs, and let the grower build a light tailored to their growing area. As common dimensions for tents are in 2', 4', and 5' increments, I suggest modules for 1', 2', and 3' squares.