Question 1

Does this lamp/light heat up the watch in a harmful way? Just got the g-shock gravitymaster and feel overprotective!

Accepted Answer

No, it does not heat up watches. In fact, your watch will feel no different from the temperature it was at when you placed it on this charger. I have a new G-Shock watch and it works great for charging mine to the max.

Question 2

Anybody charge a g shock gravity master with this? GPW 1000

Accepted Answer

I have used it on all of my solar battery watches that includes "all" Casio g-shock Master of G series and all of their Solar Tough squares as well as my Citizen Eco-Drive solar powered movements. The unit provides a 30,000 LUX light power output which charges to full capacity between and 1 and 4 hours. My Rangeman took 9 hours but that was the only exception.

Question 3

Does any direct Led light will be sufficient in doing this charger job ?

Accepted Answer

I think any high intensity led would work.  Since I have six solar watches I DIY'd my own lightbox using a usb rechargeable high intensity led bicycle handlebar headlight much like this one:
https://smile.amazon.com/dp/B018YU370M/ref=sspa_dk_detail_1?psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFQQVlSS1pIQkxXUTYmZW5jcnlwdGVkSWQ9QTA4NDE2MTExUEhXNFVPV0dZSzdMJmVuY3J5cHRlZEFkSWQ9QTAxNDMyMTBYOVBRNjAzRjQ2U1kmd2lkZ2V0TmFtZT1zcF9kZXRhaWwyJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
Except mine had a little more lumens and it was cheaper, a total of seven bucks...ebayed it from China.  
This way I can charge all my watches at the same time using only this one bicycle headlight. What I like about the bike headlight is that it has a special lens that evenly distributes its light throughout its focus without hot spots so all my watches receive the same amount of very intense light.  Also it was a lot cheaper than this one-at-a-time light charger and I can do all six of my solar watches at the same time.

Question 4

How long does it take for it to fully charge a Citizen eco drive Promaster Tough watch?

Accepted Answer

If it doesn't have a gauge then you truly cannot determine if it's fully charged: but, if the second hand's not jumping two seconds at a time, the watch is fine. My Tough doesn't have a gauge but my other Citizen does and I keep both of them exposed to the same amount of UV light so when the gauge is reading full on one, I know my Tough's good to go.

ASIN	B00ZOWJI7A
Additional Features	Overheating
Amperage	2 Amps
Box Contents	Cable, User Manual, Ring, Two Soft Rubber Caps
Brand	Coolfire
Brand Name	Coolfire
Colour	dark grey
Compatible Devices	Solar Watches
Compatible Phone Models	For all kinds of eco-friendly solar watches.
Connectivity Technology	USB
Connector Type	USB Type C
Current Rating	2 Amps
Customer Reviews	4.5 out of 5 stars 5,337 Reviews
Enclosure Material	Plastic
Included Components	Cable, User Manual, Ring, Two Soft Rubber Caps
Input Voltage	4.5 Volts
Item Weight Unit of Measure	2.9 Ounces
Main Power Connector Type	USB Type C
Manufacturer	TimeChant
Model Number	CSC01
Mounting Type	Travel/laptop or desk stand
Number of Items	1
Number of Power Levels	1
Output Voltage	4.5 Volts
Portable	Yes
Power Plug Type	No Plug
Power Source	Solar Powered
Special Feature	Overheating
Specification Met	My
Total USB 2.0 Ports	1
Total USB Ports	1
UPC	841321100457 841321100952
Unit Count	1.0 Count
Wattage	1.5 Watts

Casio Solar, Citizen Eco Drive, Seiko Solar Watch Charger! CoolFire Professional Solar Watch Charger

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