Problems with calendar view

I been asked to provide a mockup for a week view for a calendar that displays room bookings

Red means there are no rooms (at peak time) available to book; orange means there are some rooms free; green means they are all free.

The rooms displayed can be changed depending on what location and filters you select.

When a user clicks on a square they are returned to a calendar day view for that room.

summary: At this point in the booking process the user is still trying to locate a date to book the room and is using the filters to find available rooms.

It is likely when this goes live most rooms will fall orange so the traffic lighting might be totally redundant.

Question: should I traffic light the calendar view only when it's likely to be most relevant ie the day view? Is it not relevant to the booking process at this stage?