17 March - 23 March 2014

To: Miss Norhafiza Bt Mohamad

From: Ruhidayu Bt Mohd Yusof

Date: 23 March 2014

Salam,

This week, I should calculate lumen per watt. There is a simple formula and the bulb's lumen is the most important data. The formula as shown below:

Lm/w = Bulb's lumen / bulb's wattage

LED lm/w:

Bulb's lumen = 1000 lm
Bulb's wattage = 16 w

Lm/w = 1000 / 16 = 62.5 lm

1 w = 62.5 lm

Fluorescent lm/w:

Bulb's lumen = 2400 lm
Bulb's wattage = 36 w

Lm/w = 2400 / 36 = 66.67 lm

1 w = 66.67 lm

Unfortunately, the sq. ft for room is not measure yet and the info for lumen per sq. ft is still not found. That's all for this week.

Suruhanjaya Tenaga headquarters

P/s : Stay tuned.