Puchong TK light selling for RM14.5.

You can do the calculation.

32W-20W=12W save.

If 1 day 8hr ON - 12Wx8hr=96whr save perday.

1 Month saving 96whr x 365 /12=2.9kwh of saving permonth.

TNB rate 0.218sen/kw x 2.9kwh=0.63sen saving each month.

Do you see your bill drop 0.63sen ?

What is power meter ?

You can find out the Led DC voltage and drive it with battery or a power supply.

Need some skill to do.

2 way. Either use power supply to check what voltage or find out the component spec and running circuit.

No skill, just throw it away.

Go get this Philips ecofit 20W T8 Led. It have 2100l.

It's almost equal to conventional 36W T8.

The 6500k make you feel like 2700l.



This post has been edited by ozak: Oct 31 2019, 08:51 AM

6500k,7000k or 3000k is a light color temperature. 3000k is a more yellowish white. While 6500k is more white. Some manufacturing keep it short as warm light and day light.

Lumens is brightness. 2100L is more brighter than 1700L. It is a correct measurement of the light brightness.

Watt is a power of the electrical appliance. The higher the watt, the more consumption of the eletricity.

From this, watt doesn't tell you how bright the light. It only tell you the light power consumption.

So how efficiency is the light?

A 24w led light produce 1920 Lumens , 1920/24 = 80L per 1 watt. It's mean the light use 1W of power consumption to produce 80L of light brightness.

Take another Philip T8 led. 20W produce 2100Lumens, 2100/20 = 105L perwatt.

That means, Philip Led T8 is more efficiency and save more as a LED light.

People always confuse between color of the light and brightness. Always read the spec of lumens = brightness and K = temperature color of the light.

You will be able to tell how bright is to step back far from the light. The overall shine the area will be lesser or further.

Having too high k light 7000k will not give higher brightness. It's the color that make you "feel" bright. Too high K will cause glare and also cause your eye have difficult look in the dark when getting age.

Of course put more led inside the tube will consume more watt. And also more bright as the LED quantity increase.

For example, the 24w led have 24pcs of LED inside where each LED consume 1watt of power.

How to increase the brightness?

Solution - increase the qty LED. So put 30pcs of LED inside will increase the brightness. But at the same time consumption also increase. 30pcs LED = 30x1w= 30watt.

Another solution is R&D a better LED where 1pcs LED produce more light at 1watt/LED.

In this way, the LED qty didn't increase but produce britghter light.

That's efficiency.

That's also why a cheaper solution have a cheaper price product. While R&D requires higher cost and time to produce a product.

Yup. it will be more widen and further. But the small number different will not give you much judge. But will have different when few yrs time usage.

When I install the philip 20W led and compare the old Fluro, I can see the old fluro shine further or cover wider area. Old T8 fluro have a higher lumens.

Even the Philip LED look whiter, it doesn't cover wider area.

You have to step back further where your eye can see the whole area in order to compare the brightness. Or if you have the light/Lumens meter to check.

In my living room, I mix the LED 3500k with 6500k. To reduce the glare of 6500k. It also gentle to my eye with yellowish white.

My sleeping room is around 2900k-3500k. It's warn yellow light. And also my car porch.

I prefer warn yellow light than 6500k.

And of course the reason we change to LED is to cost down our bill. Looking at a higher wattage light doesn't sound logic.

I not sure what age are you. But have you notice that, older people have problem seeing in dark or at night ?

They often complain that the place is too dark. While the young said it's fine?

That is the problem when you constantly expose to light too bright and glare.

Especially now 6500k is not enough for people. That is some alarming problem coming.

What happen if people chasing till 7500k or 8000k ?

3500k or yellow light is not dimly lit. Yellow light can be very bright if the lumens is high. Again don't confuse between bright and color or Lumens and kelvin.

Have you use before downlight bulb CFL which is 3500k 1600L ? If you use before, you know how bright that yellow CFL bulb.

Do you know light color have wavelenght? Why street light or your car head light is yellow? Why all the car brand don't put a 7000k head light?

I don't no that light now got 7000k.

Cause I don't chase for higher white color light.

I prefer 3500k or max 6500k mix.

If want brighter to cover large room, just get higher lumens light or increase the light qty.

Also yellow light ex- 3500k-4000k help increase the coverage area.

Last time I do conduct some experiments about suitable bright for certain activity in my home. Like if reading, what lux is suitable, watching tv or general, what lux is enough. Using a light meter.

Don't no where the topic hides already.

For room size, light bound around the wall. And also placement of the light that how increase the bright of the room without need too high lumens and color.

So why a toilet can be bright with lower lumens is because the 4 wall of the small toilet size bound the light.

Why you want a higher lumens to cover outside house?

If you want to do some work outside your house, try install 2 kind of light. Switch it off if you done your work.

Left the lower lumens light ON.

That also help reduces the bill.

Cause you are not working every day or the whole night.

Here an example of a philip LED bulb which rate at 19w, 2700k. But 1620L.

2700k is very yellow light.

But when it illuminated, the light color is like 3500k-4000k. Cause it's 1620L. Which consider very bright for a small bulb.

Brought this bulb in US, 5yrs ago. This Philips LED model doesn't sell here.

Brought in US. Use in US home.

Replace or install new?

If replace, can easily diy.

For ?

I mean the T8 tube mainly for indoor room use. Where it design is for all direction bright and short throw. (short light distance)

But the 200w LED you wonder is an outdoor spotlight narrow beam?

So for what purpose you want to apply to it?

20wx12hr=240whr/day.

240whr x 365 /12=7.3kwhr/mth

I have no spec on the 200w LED. what is the battery capacity and the hr usage is can draw before recharge ?