task of lighnting
- 1. Task / Low Ambient Lighting for Today’s Offices Five Key Findings from PIER – Finelite Research
- 2. Task Lighting Overview: Task Lights add light and eliminate shadows Within our work areas, shadows make us uncomfortable! Task lighting needs to address this fact.
- 3. Undercabinet Luminaires 1. Undercabinet lights need to eliminate shadows and add light Light on where needed vertical surface 2. Desk lamps add light Light on horizontal surface
- 4. However, it appears users do not actually use undercabinet luminaires We estimate that approximately 80% of users turn OFF their Undercabinet Light! What is going on?
- 5. Why? Too much light IS NOT good light T8, T5 and even T2 undercabinet lights are putting nearly 3-times more light than is Often recommended on the 100- surfaces! 200 fc Often 90-120 fc
- 6. What a choice: Unbearable or Uncomfortable Over 80% of workers choose uncomfortable over unbearable
- 7. Why has this situation been tolerated? • If someone needs light, it is there • Since most don’t use the undercabinet task lighting, energy use is minimized • Inertia: – No one is complaining – Its been that way for years – There are no risks associated with change – “It isn’t broken. So, don’t fix it” PIER decided it was time to look deeper.
- 8. PIER focus to explore benefits from Task/Low Ambient Task Lighting in the “GOAL” zone is the key to significant energy savings & user acceptance.
- 9. Better lighting is the RIGHT amount of light • Eliminate shadows using the right amount of light • Ways to accomplish - Dim lamp • $$$ 30-70 • Limited energy savings fc - Mechanical block • $$ • No energy savings - New white LED-based luminaire 30-70 fc •$ • Maximum energy savings
- 10. PIER, CLTC, & Finelite Develop a New LED-based Solution 1. Personal power supply: 3 Power Choices: 9W, 21W, 60W 2. Undercabinet: Vertical brightness 3 Types: 3W, 6W and 9W Latest LED technology 3. Desk Lamp: 3 Types: 3W, 6W and 9W (LED – based) 4. Control:
- 11. Here is how it “Looks” in a lab set-up Reflected glare Too much light The right amount of light Direct glare Easy on the eye Current Situation The Solution • Imbalance of room surface luminances • Balanced room surface luminances • Imbalance of light distribution on surfaces & task plane • Balanced light distribution on surfaces & task plane
- 12. Better Lighting: Layout #1
- 13. Better Lighting: Layout #2 Personal Lighting System: (4) 3W UC = 12 W (1) 3W DL = 3W Total = 15 W 9’ x 12’ Workstation = 108 sf Task: 0.14 w/sf Ambient: 0.49 w/sf Task + Ambient: 0.63 w/sf
- 14. Better Lighting: Layout #3 Personal Lighting System: (1) 6W UC =6W Total =6W 8’ x 8’ Workstation = 64 sf Task: 0.09 w/sf Ambient: 0.49 w/sf Task + Ambient: 0.58 w/sf
- 15. Better Lighting: Layout #4 Personal Lighting System: (1) 9W DL = 9W Total = 9W 8’ x 8’ Workstation = 64 sf Task: 0.14 W/sf Ambient: 0.45 W/sf Task + Ambient: 0.59 W/sf
- 16. When the Task Lighting is Right, Ambient Lighting Takes Only 0.5 to 0.65 W/sf This no longer works! This works! This works! Parabolic Linear High Efficiency NO YES YES
- 17. The Big Win: Use Task/Low Ambient for Big Savings Best Practices = 45% Savings over ASHRAE 90.1 and CA Title 24 2008
- 18. CEC-PIER — Finelite Research: Finding #1 • The quality of task lighting directly effects the amount of ambient lighting that is needed to light offices
- 19. Finding # 2: Poor Task Lighting is Expensive! 1. Energy is wasted 2. The designs are not sustainable • Too many ambient lamps, ballasts, luminaires • Higher first cost • Higher life cycle cost 3. Poor user acceptance
- 20. Finding #3: Task/Low Ambient is Affordable 2008 CA Task / Low IMPACT Title 24 Ambient UC Task $/sf $0.75 $1.07 ($0.32) extra cost Ambient $/sf $4.20 $2.33 $1.87 savings Total $/sf $4.95 $3.40 $1.55 savings Total LPD 1.1 W/sf 0.6 W/sf 0.5 W/sf 45% savings $/kWh $0.17 Op Hrs / Yr 2808 Op $ / Yr $0.53/sf $0.29/sf $0.24/sf savings
- 21. Finding #3 Means: Task/Low Ambient has Fast Payback • New Construction – Costs less! – Saves $0.24/sf in annual energy costs • Retrofit – Simple de-lamp from 1.1 W/sf LPD • Less than 5 years! – Simple de-lamp from 1.5 W/sf LPD • Less than 2.5 years!
- 22. Finding #4: Task/Low Ambient Lighting Works
- 23. Finding #5: Task/Low Ambient Act Now Office Lighting Power Density (w/sf) Illuminance Requirement Light required as the eye ages 1.0 Gap < 0.6 Title 24 - Office LPD Time in Years
- 24. For More Information • Look for CEC-PIER Final Report: Integrated Office Lighting Solution – Personal Lighting System • Visit www.cltc.ucdavis.edu – Projects Research IOLS-PLS • Visit www.finelite.com