Anyway, it seems to cover both the height and the size of the room, I would probably need 3 rows of 3 @ ~125w ? Or will 65w incandescent bulbs provide enough light?

TCP floodlight specifications

Click on the link: Compact Fluorescent Floodlight Specifications

At the bottom of that page you will see what happens to light as you get further from the fixture. EX: a 65 watt
(650 lumens) at 4 ft from the bulb gives 10 footcandles; at 12 feet it drops to 1.1 ftcandles. Go up to 950 lumens (about 85 watts on their chart) and the footcandles double at the same 12 ft height (2.2 fc). The chart does not show 20'.

Like kitchens, recessed lights is the rage. But people have to add undercounter lights to get lights closer to the work surface. I suspect you will have to add wall scounces and/or lamps to get light where you really need it. More light from other sources will reduce the need to have super bright recessed lights, strong enough to get the light you will need to read by.
Another whole concept is to wash the ceiling with lights coming from lights behind trim so the light source is not visible, but the ceiling looks nice. Remember recessed lights will not brighten the dark ceiling. Then use lighting closer to the floor to put light where you need it.

Good Luck,
Bob

From: http://www.energy.ca.gov/title24/2005standards/archive/documents/measu res/25/25_2002-03_RECESSED_CEC.PDF

Lighting: Recessed Lighting
Description
This change requires that recessed luminaries located in ceilings be designed to be air tight and rated, so
that insulation can be in direct contact with the housing. The lighting industry produces a class of
luminaire housings called ICAT (insulation contact air tight) that meet this requirement. Furthermore, if
luminaires are incandescent, they must be rated for 75 Watts or less. The following is preliminary language
to be included in §150(k).
§150 (k)
Recessed luminaires installed in residences shall meet the following requirements:
1. Shall be rated for "insulated ceiling air tight (ICAT)".
2. If equipped with an Edison or screw base, shall have an aperture not larger than
5" and shall be rated for 75 Watts or less.
This measure would ensure that:
1. Ordinary 6" low cost, incandescent recessed "can" lights, rated up to 150 watts ICAT,
would be eliminated from the marketplace, preventing socket wattage from exceeding 75
Watts. Builders would be encouraged to employ the most energy efficient halogen
PAR20 and PAR30 lamps instead of inefficient R30 and R40 lamps, reducing typical
socket Watts by at least 25 Watts. Or alternatively, the contractor might employ low
voltage lighting, which also employs lamps of 75 Watts or less.
a. Most lighting installed in homes uses R lamps. The 75PAR30 produces as much
effective illumination as a 6" can with a 100-120 Watt R lamp. There will be no need to
add more cans.
b. The low voltage and compact fluorescent options are viable choices for individual
homeowners, architects and designers.
2. For situations demanding more light from recessed "can" lights, usually in kitchens,
builders would be encouraged to employ compact fluorescent "can" lights, which tend to
be more expensive on a unit basis than tungsten luminaires, but competitive to employing
additional 5" tungsten can lights, once labor and wiring costs are considered.
Benefits
This requirement would reduce heat losses through residential ceilings and also reduce lighting energy.
Heat loss reductions would result in lowered heating and cooling energy and may also affect the efficiency
of HVAC ducts. The change will save at least 25 Watts per recessed "can" light in conventional residential
lighting.
Environmental Impact
The environmental impacts of this requirement are positive, including the increased use of fluorescent
lighting in residences, which can increase mercury use. However, local increases of mercury are
outweighed by the benefit of reductions in air-born mercury at power plants.
Type of Change
This change would be implemented as a mandatory measure in §130 (hotel/motels) and §150 (low rise
residential). The Residential and Nonresidential Manuals should be updated to explain the requirement. It
would also be beneficial for the Commission to develop and disseminate a fact sheet to all electrical
manufacturers and distributors, prior to implementing the measure.
Measure Availability and Cost
All major manufacturers of recessed lighting in the U.S. produce, or could easily produce,
products to meet this requirement. Prices, availability, and selection of current products (e.g.
Halo H5 family) are consistent with, and to some degree cost less, than the 6" family equivalents.
Including trim, costs for builder-grade ICAT can lights are presently about $25 per luminaire more
expensive than the non-ICAT lights.
PNNL is presently funding the development of residential-grade, compact fluorescent luminaires that meet
these requirements. It is strongly believed that a reasonably-priced, ICAT dimmable downlight can be
produced using offshore manufacturing to cost within $25 of the current tungsten equivalent (about $75).
Useful Life, Persistence and Maintenance
This requirement will result in lighting systems that will persist, cannot be easily circumvented, provide
reasonable aesthetics and choice, generally enjoy longer lamp life than the base case, and permit dimming.
Performance Verification
There is no need for performance verification for this requirement. Typical plan checking and field
inspection prior to framing will be adequate to verify compliance.
Cost Effectiveness
This requirement is cost effective and calculations will be performed in subsequent tasks to demonstrate
this. For example, consider the following: Assume a home has 500 annual hours of lighting operation at
$0.15 per kWh for electricity. A compact fluorescent luminaire saves at least 65 Watts, as compared to a
100-Watt R or PAR lamp typically used in the 6" can, and produces the same amount of light. The
homeowner saves about $5 per year for each luminaire. If the cost premium is $25/luminaire, the simple
payback is about five years.
Analysis Tools
This requirement would be implemented as a mandatory measure and no analysis tools would be needed
for compliance purposes. For cost effectiveness calculations, a simple "Energy = Power x Time"
relationship will be used, coupled with data on typical lighting hours in residential applications, as well as
power savings between conventional luminaires and those required by this measure. The benefits of
reduced heat loss through the ceiling would be quantified using MICROPAS or CALRES.
Relationship to Other Measures
This measure is related to other high efficacy requirements for residential lighting.
Bibliography and Other Research
PNNL research on recessed compact fluorescent luminaires will be consulted. Apart from this,
manufacturers specification sheets will provide power and cost data.

Juno IC2 and Lightolier 1100IC with the trim of your choice
You should probably contact them.

MH is usually not going to work out in a residential setting. Some of the issues are that they take a few moments to come up to full brightness and take even longer to cool down and restrike if you turn them off and back on. Pulse start MH lamps are fastest but we're still talking a couple of minutes restrike. They are not dimmable. There are also color quality issues and color variation issues.

Norm's suggestion for Par 38 halogen spot lamps is the tool of choice to light residential spaces with 20' high ceilings. To enhance the look of this I recommend a deeper housing than Norm however. I find the relatively shallow standard housings to not conceal the lamp enough with such high ceilings.

I guess going back to the PAR38 halogen spots is probably the best idea. Probably spaced 6' apart and then wall washers + pendant lights added.

Never knew it would be so difficult to light.